{ "data": { "a": { "slug": "inworld-voice-cloning", "name": "Inworld Instant Voice Cloning", "vendor": "Inworld AI", "vendorUrl": "https://inworld.ai", "kind": "model", "category": "voice-cloning", "summary": "Inworld's Instant Voice Cloning API makes a reusable text-to-speech voice from 3 to 30 seconds of audio in one synchronous call, for Inworld's TTS-2 models. The same operation is in the Inworld CLI and its bundled MCP server.", "url": "https://www.anchorterminal.com/tools/inworld-voice-cloning", "markdownUrl": "https://www.anchorterminal.com/tools/inworld-voice-cloning.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/inworld-voice-cloning.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/inworld-voice-cloning.json", "dns": "inworld-voice-cloning.grade.anchorterminal.com", "repo": "https://github.com/inworld-ai/inworld-api-examples", "license": "Proprietary service under Inworld's Terms of Service. The `@inworld/cli` and `@inworld/tts` npm packages and the examples repository are MIT", "transports": [ "http", "stdio", "streamable-http" ], "remoteUrl": "https://api.inworld.ai", "packages": [ { "registry": "npm", "name": "@inworld/cli" }, { "registry": "npm", "name": "@inworld/tts" }, { "registry": "pypi", "name": "inworld-tts" } ], "auth": "api-key", "authNotes": "Self-serve workspace API key from the Portal or `inworld workspace add-key`, sent as `Authorization: Basic` with the Base64 credential as copied. Keys are read-only for the Voice API by default, and cloning, updating and deleting voices need the write toggle, which can be changed on an existing key. Deleting a key revokes it. One-time tokens minted from a key serve browser and mobile clients.", "pricing": "freemium", "pricingNotes": "Creating an instant clone has no charge in the docs or on the pricing page. Speech from a clone costs $25 per million characters on TTS-2 or $15 on TTS-2 Flash on the free On-Demand plan, falling on the $25, $100, $300 and $1,500 monthly plans. On-Demand allows 100 custom voices and 2 cloning requests a minute (checked 2026-11-06).", "priceSummary": "$25 / mo", "where": "both", "x402": { "level": "no", "evidence": "No x402, MPP or L402 in the docs, llms.txt or the pricing page (checked 2026-11-06). Credits are bought at a checkout page, $10 minimum.", "endpoints": [] }, "toolCount": 40, "popularity": { "githubStars": null, "npmWeekly": 3632, "pypiWeekly": null, "asOf": "2026-11-06" }, "docsUrl": "https://docs.inworld.ai/tts/instant-voice-cloning", "llmsTxt": "https://docs.inworld.ai/llms.txt", "capabilities": [ "voice.clone", "voice.design", "speech.tts" ], "tags": [ "hosted", "official", "freemium", "free-tier", "no-card", "closed-source", "python", "typescript", "llms-txt", "mcp", "cli", "status-page", "soc2" ], "lastRelease": "2026-10-29", "graded": true, "anchor": { "graded": true, "score": 61.9, "grade": "C", "agentReady": false, "rank": 588, "ranked": true, "rankOf": 1510, "categoryRank": 4, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 64, "maintenance": 68, "payments": 40, "reliability": 75, "schema": 64, "security": 55, "transparency": 63 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-06" }, "negative": 0, "verdict": "One JSON call returns a usable voice ID from 3 to 30 seconds of audio, with no charge per clone and 100 custom voices on the free plan, behind keys that are read-only until write access is switched on. The API has no consent field, and Zero Data Retention excludes cloning samples.", "bestFor": "Teams already using Inworld TTS-2 that want clones from a short clip through one call, the CLI or MCP.", "strengths": [ "Synchronous clone from 3 to 30 seconds of WAV or MP3 audio, with language auto-detection and optional background-noise removal", "No charge per clone. The free On-Demand plan includes instant cloning and 100 custom voices, and speech is $25 per million characters on TTS-2", "API keys are read-only by default. Cloning, updating and deleting voices need a write toggle that can be changed on an existing key", "`GET /voices/v1/voices` filters by `source = \"IVC\"` with paging, and `voices:customVoiceCapacity` reports how many custom voices remain", "`llms.txt`, `llms-full.txt` and a Markdown twin of every docs page, plus `clone_voice` in the MCP server in `@inworld/cli` 1.5.0 (29 October 2026)" ], "weaknesses": [ "No consent, verification or watermark field in the clone API. Only the Portal flow asks the user to confirm rights to the voice", "Zero Data Retention does not cover cloning audio samples, and no retention period for them was found", "No idempotency key on `POST /voices/v1/voices:clone`, and no error list for the Voice API", "No OpenAPI file is linked from the docs, and the repositories named in the npm metadata of the CLI and Node SDK are not public", "The MCP `clone_voice` description says about 5 seconds and 4 MB a sample, while the docs say 3 seconds and 12 MB" ], "agentNotes": [ "Create the key with write access (`inworld workspace add-key --write`). A default key gets code 7, insufficient access level, on `voices:clone`", "Send the complete Base64 credential as `Authorization: Basic $INWORLD_API_KEY`. Don't encode it again", "Send one 10 to 30 second WAV or MP3 clip as base64 in `voiceSamples[].audioData`. Audio past 30 seconds is cut", "Don't blind-retry a clone. There's no idempotency key, so list voices with `filter=source=\"IVC\"` first, and back off with jitter on 429", "Set `gender`, `ageGroup` and `categories` with UpdateVoice afterwards. The clone call ignores them without an error", "The response echoes up to 15 seconds of processed audio as base64 in `audioSamplesValidated`. Drop it before passing the result to a model" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 0, "avgRating": 0, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "C", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 61.9 } ], "editorialScores": { "ergonomics": 64, "maintenance": 68, "payments": 40, "reliability": 75, "schema": 64, "security": 55, "transparency": 51 }, "provenanceScore": 75, "checked": { "categories": { "ergonomics": "2026-11-06", "maintenance": "2026-11-06", "payments": "2026-11-06", "reliability": "2026-11-06", "schema": "2026-11-06", "security": "2026-11-06", "transparency": "2026-11-06" }, "last": "2026-11-06", "oldest": "2026-11-06", "stale": false, "staleAfterDays": 90 } }, "connect": { "install": "npm install -g @inworld/cli", "http": "curl --location 'https://api.inworld.ai/voices/v1/voices:clone' \\\n --header \"Authorization: Basic $INWORLD_API_KEY\" \\\n --header 'Content-Type: application/json' \\\n --data '{\"displayName\": \"my_voice_clone_demo\", \"languageCode\": \"en-US\", \"voiceSamples\": [{\"audioData\": \"\u003cbase64-audio-data\u003e\"}]}'", "claudeCode": "claude mcp add inworld -- inworld mcp", "config": { "mcpServers": { "Inworld": { "args": [ "mcp" ], "command": "inworld" } } } }, "letme": { "capability": "https://letme.dev/voice.clone", "tool": "https://letme.dev/inworld-voice-cloning" }, "sameCompany": [ "inworld-stt", "inworld-tts", "inworld-realtime" ], "area": "voice", "unitPrices": [ { "item": "Speech from a clone, TTS-2, On-Demand", "unit": "1m-chars", "usd": 25, "note": "$20, $17.50, $15 and $12.50 on the monthly plans" }, { "item": "Speech from a clone, TTS-2 Flash, On-Demand", "unit": "1m-chars", "usd": 15, "note": "$10 down to $7 on the monthly plans" }, { "item": "Creator plan", "unit": "month", "usd": 25, "note": "credits equal to the price, 500 custom voices, 3 clone requests a minute" }, { "item": "Builder plan", "unit": "month", "usd": 100, "note": "3,000 custom voices, 5 clone requests a minute" }, { "item": "Developer plan", "unit": "month", "usd": 300, "note": "10,000 custom voices, 10 clone requests a minute" }, { "item": "Growth plan", "unit": "month", "usd": 1500, "note": "30,000 custom voices, 20 clone requests a minute" } ], "provenance": { "legalEntity": "Theai, Inc. dba Inworld AI", "domain": "inworld.ai", "domainRegistered": "", "endpointOnVendorDomain": true, "terms": "https://inworld.ai/terms", "privacy": "https://inworld.ai/privacy", "statusPage": "https://status.inworld.ai", "changelog": "https://docs.inworld.ai/release-notes/tts", "securityTxt": "none", "checked": "2026-11-06", "notes": [ "The Terms of Service (effective 11 June 2025, re-read 6 November 2026) are an agreement with Theai, Inc. dba Inworld AI under California law. They carry no clause on robots or automated access, and none specific to voice cloning.", "inworld.ai's robots.txt carries `Content-Signal: ai-train=no, search=yes, ai-input=no`, recorded as a fact about the site. Since 30 October 2026 this is not a reason to hold, so this listing, held on 9 October for it, is graded.", "status.inworld.ai draws incidents from GitHub issues in inworld-ai/inworld-issue-status, read through the GitHub API on 6 November.", "inworld.ai/.well-known/security.txt returned 404 on 30 October per the inworld-tts check. The security page links a vulnerability report form." ], "score": 75 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/inworld-voice-cloning.json", "live": { "slug": "inworld-voice-cloning", "probe": { "target": "https://api.inworld.ai", "method": "get", "lastAt": "2026-11-07T19:22:14.002705937Z", "lastOk": true, "lastStatus": 200, "lastMs": 152, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 137, "p95ms24h": 266, "samples24h": 210, "samples30d": 210, "days": [ { "date": "2026-11-06", "probes": 13, "ok": 13 }, { "date": "2026-11-07", "probes": 197, "ok": 197 } ] }, "versions": [ { "registry": "npm", "name": "@inworld/cli", "version": "1.5.0", "seenAt": "2026-11-06T23:35:10.767231519Z" }, { "registry": "npm", "name": "@inworld/tts", "version": "1.1.1", "seenAt": "2026-11-06T23:35:12.902766977Z" }, { "registry": "pypi", "name": "inworld-tts", "version": "1.2.1", "released": "2026-05-06", "seenAt": "2026-11-06T23:35:14.803764179Z" } ], "githubStars": 66, "npmWeekly": 290, "pypiWeekly": 4010, "securityTxt": { "url": "https://inworld.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:11.794771951Z" }, "llmsTxt": { "url": "https://docs.inworld.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:32:51.758972379Z" }, "updatedAt": "2026-11-07T19:22:14.002705937Z" } }, "answer": "Inworld Instant Voice Cloning scores 61.9 (C) on agent readiness against Resemble AI Voice Cloning API's 52.5 (D), and leads in 4 of 7 scored categories. Resemble AI Voice Cloning API leads on schema \u0026 documentation and transparency \u0026 trust.", "b": { "slug": "resemble-ai-voice-cloning", "name": "Resemble AI Voice Cloning API", "vendor": "Resemble AI", "vendorUrl": "https://www.resemble.ai", "kind": "model", "category": "voice-cloning", "summary": "Resemble AI's service for creating custom voices for speech generation.", "url": "https://www.anchorterminal.com/tools/resemble-ai-voice-cloning", "markdownUrl": "https://www.anchorterminal.com/tools/resemble-ai-voice-cloning.md", "slimMarkdownUrl": "https://www.anchorterminal.com/tools/resemble-ai-voice-cloning.min.md", "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/resemble-ai-voice-cloning.json", "dns": "resemble-ai-voice-cloning.grade.anchorterminal.com", "repo": "https://github.com/resemble-ai/resemble-node", "transports": [ "http" ], "remoteUrl": "https://app.resemble.ai/api/v2", "packages": [ { "registry": "npm", "name": "@resemble/node" }, { "registry": "pypi", "name": "resemble" } ], "auth": "api-key", "authNotes": "`Authorization: Bearer` API key. Voice creation, recordings and builds run on `app.resemble.ai/api/v2`, speech from the clone on `f.cluster.resemble.ai`.", "pricing": "paid", "pricingNotes": "The Voice Cloning API needs a Business or Enterprise plan per the 2 October 2026 check. The changelog says the first clone is free and later ones $2, with card capture after the first. Per-second and per-slot prices weren't re-read on 4 November 2026, and the earlier figures came from a billing data endpoint this run doesn't read.", "priceSummary": "Paid", "where": "hosted", "x402": { "level": "no", "evidence": "No x402 or machine payment in the docs or pricing (checked 2026-09-30).", "endpoints": [] }, "toolCount": null, "popularity": { "githubStars": 15, "npmWeekly": 8053, "pypiWeekly": null, "asOf": "2026-09-30" }, "docsUrl": "https://docs.resemble.ai/voice-creation/voices/clone-overview", "llmsTxt": "https://docs.resemble.ai/llms.txt", "openapi": "https://docs.resemble.ai/openapi.json", "capabilities": [ "voice.clone", "speech.tts" ], "tags": [ "hosted", "closed-source", "python", "typescript", "openapi", "llms-txt", "webhooks", "async-jobs", "watermark", "enterprise" ], "lastRelease": "2026-06-30", "graded": true, "anchor": { "graded": true, "score": 52.5, "grade": "D", "agentReady": false, "rank": 985, "ranked": true, "rankOf": 1510, "categoryRank": 12, "methodology": "0.7", "run": "2026-10-01", "scores": { "ergonomics": 66, "maintenance": 30, "payments": 0, "reliability": 65, "schema": 81, "security": 54, "transparency": 75 }, "pending": [ "performance", "tasks" ], "assessment": { "confidence": "medium", "date": "2026-11-04" }, "negative": -3, "negativeNotes": [ "2026-06-29: the changelog says Resemble 'began deprecating all older voice models' that day, with no model list or notice period, and the model versions page says voices on the seven end-of-life models can no longer generate audio until upgraded to Resemble Ultra. On 2026-06-30 API-created voices switched to rapid clones by default, announced the same day. Previously working requests fail with notice only after the change, so this run's same-day -3, the two folded into one term. Per the 2 October check, not re-read on 4 November. https://www.resemble.ai/changelog and https://docs.resemble.ai/getting-started/model-versions" ], "verdict": "Rapid clones from 10 seconds of audio, ready in under a minute, with a public OpenAPI file and a stated no-training policy for customer voice data. Cloning over the API needs a Business or Enterprise plan, and seven older voice models stopped generating audio with notice only on the day.", "bestFor": "Teams already paying for Resemble's detection and watermarking who want clones in the same account.", "strengths": [ "Rapid clones from 10 seconds of audio, ready in under a minute", "Training webhook through `callback_uri`, and STOI, PESQ and SI-SDR scores for problem recordings", "Privacy policy says customer voice data isn't used to train general-purpose models, and synthesis text and audio aren't kept after delivery", "Named subprocessor list and US hosting regions published, ISO 27001:2022 listed as attested", "Public OpenAPI file, llms.txt and a published limit of 40 requests a second" ], "weaknesses": [ "Cloning API only on Business and Enterprise plans, and no per-unit API price we could read today", "No consent or speaker verification step in the API reference", "Seven older TTS models are end of life and their voices can't generate audio until upgraded. The 29 June 2026 changelog entry gave no notice period", "Error responses carry no codes, create-voice documents only a 200, and nothing is documented for 429", "No security.txt, disclosure policy or bug bounty, and SOC 2 Type 2 was still in observation two days after its expected report date" ], "agentNotes": [ "Create the voice, upload recordings or pass `dataset_url`, then call `/build`. Nothing trains until you do", "Set `callback_uri` rather than polling for `status` to reach `finished`", "Expect a rapid clone. Since 2026-06-30 API-created voices default to rapid, and create-voice has no field to pick another type", "Upgrade any voice on a pre-Ultra model before synthesis, since those voices can no longer generate audio", "Check `success` in every response body, log the request ID, and stay under 40 requests a second per token with your own backoff" ], "metrics": { "kind": "remote", "measured": false }, "reviewCount": 2, "avgRating": 2.5, "history": [ { "basis": "public evidence", "confidence": "medium", "grade": "D", "methodology": "0.7", "pending": [ "performance", "tasks" ], "run": "2026-10-01", "runLabel": "October 2026 research run", "score": 52.5 } ], "editorialScores": { "ergonomics": 66, "maintenance": 30, "payments": 0, "reliability": 65, "schema": 81, "security": 54, "transparency": 70 }, "provenanceScore": 80, "checked": { "categories": { "ergonomics": "2026-11-04", "maintenance": "2026-11-04", "payments": "2026-11-04", "reliability": "2026-11-04", "schema": "2026-11-04", "security": "2026-11-04", "transparency": "2026-11-04" }, "last": "2026-11-04", "lastMoved": "2026-11-04", "oldest": "2026-11-04", "stale": false, "staleAfterDays": 90 } }, "connect": { "http": "curl -X POST https://app.resemble.ai/api/v2/voices -H \"Authorization: Bearer $RESEMBLE_API_KEY\" \\\n -H \"content-type: application/json\" \\\n -d '{\"name\":\"Support voice\",\"dataset_url\":\"https://example.com/sample.wav\",\"callback_uri\":\"https://example.com/hooks/resemble\"}'" }, "letme": { "capability": "https://letme.dev/voice.clone", "tool": "https://letme.dev/resemble-ai-voice-cloning" }, "sameCompany": [ "resemble-ai-tts" ], "area": "voice", "provenance": { "legalEntity": "Resemble AI, Inc.", "domain": "resemble.ai", "domainRegistered": "2018-11-12", "endpointOnVendorDomain": true, "terms": "https://www.resemble.ai/terms-of-service", "privacy": "https://www.resemble.ai/privacy-policy", "statusPage": "https://status.resemble.ai", "changelog": "https://www.resemble.ai/changelog", "securityTxt": "none", "checked": "2026-09-30", "notes": [ "The privacy policy gives the address as 812 W Dana St, Mountain View, California" ], "score": 80 }, "pageJsonUrl": "https://www.anchorterminal.com/tools/resemble-ai-voice-cloning.json", "live": { "slug": "resemble-ai-voice-cloning", "probe": { "target": "https://app.resemble.ai/api/v2", "method": "get", "lastAt": "2026-11-07T19:22:29.812286446Z", "lastOk": true, "lastStatus": 404, "lastMs": 169, "authRequired": false, "uptime24h": 100, "uptime30d": 100, "p50ms24h": 169, "p95ms24h": 373, "samples24h": 238, "samples30d": 7920, "days": [ { "date": "2026-10-07", "probes": 272, "ok": 272 }, { "date": "2026-10-08", "probes": 268, "ok": 268 }, { "date": "2026-10-09", "probes": 250, "ok": 250 }, { "date": "2026-10-10", "probes": 247, "ok": 247 }, { "date": "2026-10-11", "probes": 247, "ok": 247 }, { "date": "2026-10-12", "probes": 247, "ok": 247 }, { "date": "2026-10-13", "probes": 248, "ok": 248 }, { "date": "2026-10-14", "probes": 249, "ok": 249 }, { "date": "2026-10-15", "probes": 253, "ok": 253 }, { "date": "2026-10-16", "probes": 252, "ok": 252 }, { "date": "2026-10-17", "probes": 253, "ok": 253 }, { "date": "2026-10-18", "probes": 256, "ok": 256 }, { "date": "2026-10-19", "probes": 255, "ok": 255 }, { "date": "2026-10-20", "probes": 252, "ok": 252 }, { "date": "2026-10-21", "probes": 253, "ok": 253 }, { "date": "2026-10-22", "probes": 253, "ok": 253 }, { "date": "2026-10-23", "probes": 248, "ok": 248 }, { "date": "2026-10-24", "probes": 251, "ok": 251 }, { "date": "2026-10-25", "probes": 250, "ok": 250 }, { "date": "2026-10-26", "probes": 252, "ok": 252 }, { "date": "2026-10-27", "probes": 249, "ok": 249 }, { "date": "2026-10-28", "probes": 250, "ok": 250 }, { "date": "2026-10-29", "probes": 249, "ok": 249 }, { "date": "2026-10-30", "probes": 249, "ok": 249 }, { "date": "2026-10-31", "probes": 251, "ok": 251 }, { "date": "2026-11-01", "probes": 249, "ok": 249 }, { "date": "2026-11-02", "probes": 250, "ok": 250 }, { "date": "2026-11-03", "probes": 248, "ok": 248 }, { "date": "2026-11-04", "probes": 246, "ok": 246 }, { "date": "2026-11-05", "probes": 185, "ok": 185 }, { "date": "2026-11-06", "probes": 241, "ok": 241 }, { "date": "2026-11-07", "probes": 197, "ok": 197 } ] }, "vendorStatus": { "page": "https://status.resemble.ai", "indicator": "unknown", "summary": "no machine-readable status found", "checkedAt": "2026-11-07T04:48:40.575174845Z" }, "versions": [ { "registry": "npm", "name": "@resemble/node", "version": "3.5.3", "seenAt": "2026-11-07T00:01:29.153330736Z" }, { "registry": "pypi", "name": "resemble", "version": "1.9.0", "released": "2026-04-06", "seenAt": "2026-11-07T00:01:29.367926456Z" } ], "githubStars": 15, "npmWeekly": 2708, "pypiWeekly": 266, "securityTxt": { "url": "https://resemble.ai/.well-known/security.txt", "state": "none", "checkedAt": "2026-11-07T16:01:21.226972005Z" }, "llmsTxt": { "url": "https://docs.resemble.ai/llms.txt", "ok": true, "status": 200, "checkedAt": "2026-11-07T15:33:49.024704863Z" }, "domain": { "domain": "resemble.ai", "registered": "2018-11-12", "source": "https://rdap.identitydigital.services/rdap/domain/resemble.ai", "checkedAt": "2026-11-01T14:11:31.603734411Z" }, "github": { "repo": "resemble-ai/resemble-node", "checkedAt": "2026-11-02T09:21:24.993832128Z", "stars": 15, "archived": false, "issuesEnabled": true, "pushedAt": "2026-04-06T21:14:23Z", "openIssues": 3, "openPRs": 0, "issuesOpened90d": 0, "issuesClosed90d": 0, "prsMerged90d": 0, "replies": { "sampled": 4, "unanswered": 3, "medianDays": 50.5 } }, "updatedAt": "2026-11-07T19:22:29.812286446Z" } }, "edges": [ { "by": 40, "category": "payments", "leads": "inworld-voice-cloning", "name": "Payments \u0026 pricing", "reasons": { "a": "No x402, MPP or L402 (0). The pricing page, unread on 9 October and read on 6 November, publishes per-character rates for speech from a clone, $25 per million characters on TTS-2 and $15 on TTS-2 Flash on the free plan, and no charge for creating a clone (20, was 10). The On-Demand plan is free with 100 custom voices and instant cloning, and no card is asked for (20). `inworld login` opens a browser and signup is a human flow. The CLI mints keys only after that (0). 0+20+20+0 = 40.", "b": "No x402, MPP or L402 (0). The per-second speech and per-slot prices were read on 30 September from app.resemble.ai/billing/api/v1/plans, a billing data endpoint this run doesn't read, so that reading is struck, and the pricing pages can't be re-read under the terms, so no per-unit price for the API stands today (0). The changelog's $2 for later clones is the Flex web app's, not the API's. No API cloning below Business per the 2 October check, and the free first clone in the Flex web app captures a card for later clones (0). Signup is a human browser flow (0)." }, "scores": { "a": 40, "b": 0 } }, { "by": 38, "category": "maintenance", "leads": "inworld-voice-cloning", "name": "Maintenance \u0026 community", "reasons": { "a": "Read as a model, on the lines inworld-tts and cartesia-voice-cloning use (recency 30, dated releases 10, deprecation notice 10, support 15, SDKs 15, health 10). The 9 October draft used the tool lines and gave 75. `@inworld/cli` 1.5.0, whose MCP server carries `clone_voice`, on 29 October 2026, after 1.4.0 (13 October), 1.4.1 (23 October), 1.4.2 and 1.4.3 (25 October) (30). Dated TTS release notes on 9 August and 11 September 2026, and none for the 28 October model update or for the Voice API (10). `inworld-tts-1` was discontinued on 15 June 2026 with requests routed to newer models, and clones made before 15 August keep a 15-second prompt, with no notice period stated (5 of 10). A public changelog, a Discord server and support@inworld.ai, with no evidence read of how they answer (8 of 15). `@inworld/tts` 1.1.1 dates from 6 May 2026 (10 of 15). The CLI is current, but the repositories named in its npm metadata aren't public (5 of 10). 30+10+5+8+10+5 = 68.", "b": "Newest changelog entry 2026-06-30 per the 2 October check, not re-read on 4 November (terms), 127 days old (10 of 30). No dated entries in the last 90 days that we could read (0). Public changelog, no answering support channel confirmed (5 of 15). The Node SDK clone on 4 November still ends at 754a91e (6 April 2026, 3.5.3, zero-retention mode); Python 1.9.0 of 6 April per PyPI on 2 October, not re-read. Neither has a release since the June model changes (12 of 15). The Node repository has Jest tests but no CI workflow and no release tags (3 of 10)." }, "scores": { "a": 68, "b": 30 } }, { "by": 17, "category": "schema", "leads": "resemble-ai-voice-cloning", "name": "Schema \u0026 documentation", "reasons": { "a": "No OpenAPI file is linked from the docs or `llms.txt`, re-read on 6 November. The MCP server has typed inputs on all 40 tools, which earns part of the line (10 of 25). `llms.txt`, `llms-full.txt` and Markdown twins (10). The guides say when to use instant cloning, Professional Voice Cloning or Voice Design, and the reference warns which fields are ignored (15 of 20). Required fields and base64 audio are typed, and a new `languageCode` string is validated against the catalogue with `INVALID_ARGUMENT`, while size and length limits sit in prose and the MCP tool still states different ones (10 of 15). Examples in curl, Python, JavaScript and the CLI, with one error response shown and no error list for the Voice API (9 of 15). A `/v1/` path and dated TTS release notes, newest 11 September, with no changelog for the Voice API itself (10 of 15). 10+10+15+10+9+10 = 64.", "b": "Public OpenAPI 3.1 at docs.resemble.ai/openapi.json (25). llms.txt (10). The clone overview separates rapid and professional clones and says how much audio each needs (12 of 20). Typed create fields, including `dataset_url`, `callback_uri` and `language`, and `page_size` bounded to 10 to 1,000 (12 of 15). Examples, plus dataset quality scores (STOI, PESQ, SI-SDR) for bad recordings. The spec documents only 200 responses on the voice, build and delete operations, and the errors page gives one generic shape, `success: false` with a message (7 of 15). Versioned `/api/v2` paths and a dated public changelog (15). All per the 2 October check, not re-read on 4 November (Resemble's terms bar automated means)." }, "scores": { "a": 64, "b": 81 } }, { "by": 12, "category": "transparency", "leads": "resemble-ai-voice-cloning", "name": "Transparency \u0026 trust", "reasons": { "a": "Closed service with clear terms naming Theai, Inc. dba Inworld AI, read on 6 November (unread on 9 October because of the Content-Signal line), and MIT client packages on npm (15 of 30, was 8). The Zero Data Retention page is specific that cloning samples are retained to build the voice, but gives no period, and the Terms' no-training clause and the Privacy Notice's training use sit side by side without a reconciling sentence, as on inworld-tts (14 of 30). Dated notices in the docs, `inworld-tts-1` discontinued on 15 June 2026 and the 30-second clone limit from 15 August, with release stages defined and no written notice period (12 of 20). US by default with isolated EU and India regions on Enterprise. No sub-processor list was found in the docs (10 of 20). 15+14+12+10 = 51.", "b": "Closed service with clear terms (15 of 30). The privacy policy of 14 August 2026 states no training on customer voice data, retention while the account is active plus 30 days, no retention of synthesis text or audio, and points to a DPA and a named subprocessor list. That agrees with the terms, which have Resemble destroy voice models on request after termination (25 of 30). The changelog's 29 June 2026 entry says Resemble 'began deprecating all older voice models', with no notice period. The model versions page now lists seven end-of-life TTS models, Chatterbox and Chatterbox-Turbo among them, and says voices still on them can no longer generate audio until upgraded to Resemble Ultra, but gives no dates or notice policy (10 of 20). Subprocessors named at trust.resemble.ai/subprocessors, and hosting stated as the United States on Google Cloud us-east4, Render in Oregon and Cerebrium (20 of 20). Privacy, subprocessor and model-version pages per the 2 October check, not re-read on 4 November (Resemble's terms bar automated means); the terms of 14 August 2026 re-read." }, "scores": { "a": 63, "b": 75 } }, { "by": 10, "category": "reliability", "leads": "inworld-voice-cloning", "name": "Reliability", "reasons": { "a": "Graded on the REST API, the surface an agent would call. Status page at status.inworld.ai, drawn from GitHub issues, with five components and none for cloning (20). Read through the GitHub API on 6 November, the 90 days from 8 August hold two incidents, 29 minutes of elevated TTS latency on 25 August and 26 minutes of elevated TTS 2.1 errors from a network fault at one GPU site on 28 October, both minor (20). Cloning limits are published per plan, 2 to 20 requests a minute (15). A 429 is documented with exponential backoff and jitter code, and since the 9 October check the rate-limits page says limits over a minute can carry `Retry-After`. No idempotency key or safe-retry guidance for clone creation (10 of 15, was 9). The pricing page, now read, names an SLA on Enterprise only with no terms or figure, as on inworld-tts (0). Instant cloning carries no Preview or Beta mark (10). 20+20+15+10+0+10 = 75.", "b": "Status page at status.resemble.ai (Checkly) with component history (20). The current components cover the web app, Resemble Ultra TTS and the safety APIs. The history shows a 'Chatterbox Turbo Rapid Voice Clones' component in July that's no longer listed. Since early July the voice surfaces had only short incidents, several of 1 to 5 minutes on rapid voice clones from 6 to 9 July and 1 minute on Ultra TTS on 22 September. The Identities API, a separate product, has had an incident open since 9 September, and Detect had a 50-minute incident on 27 August. Minor incidents only on the voice surfaces (20). 40 requests a second per API token on the rate-limits page, 10 a minute on audio enhancement (15). The rate-limits and error pages say nothing about 429, Retry-After or backoff (0). No SLA found (0). Rapid and professional clones are generally available (10). All per the 2 October check, not re-read on 4 November (Resemble's terms bar automated means). The status history was read to 2 October; the rest of the window from 6 August is unread, so the incident line keeps its recorded 20." }, "scores": { "a": 75, "b": 65 } } ], "facts": [ { "a": "Model API", "b": "Model API", "name": "Kind" }, { "a": "Inworld AI", "b": "Resemble AI", "name": "Vendor" }, { "a": "https://api.inworld.ai", "b": "https://app.resemble.ai/api/v2", "name": "Hosted endpoint" }, { "a": "HTTP, stdio, Streamable HTTP", "b": "HTTP", "name": "Transports" }, { "a": "API key", "b": "API key", "name": "Auth" }, { "a": "Freemium", "b": "Paid", "name": "Pricing" }, { "a": "$15 per 1M characters", "b": "not published", "name": "Price for voice cloning" }, { "a": "no", "b": "no", "name": "x402" }, { "a": "Proprietary service under Inworld's Terms of Service. The `@inworld/cli` and `@inworld/tts` npm packages and the examples repository are MIT", "b": "none", "name": "Licence" }, { "a": "40", "b": "none", "name": "Tools exposed" }, { "a": "yes", "b": "no", "name": "Read-only variant documented" }, { "a": "yes", "b": "yes", "name": "llms.txt" }, { "a": "2026-10-29", "b": "2026-06-30", "name": "Last release" }, { "a": "2025-06-11", "b": "2026-08-14", "name": "Terms last updated" }, { "a": "2026-01-18", "b": "2026-08-14", "name": "Privacy policy last updated" }, { "a": "not found in the text", "b": "not found in the text", "name": "Customer content may train models" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict automated access" }, { "a": "not found in the text", "b": "yes", "name": "Terms restrict benchmarking" }, { "a": "not found in the text", "b": "yes", "name": "Terms or service can change without notice" }, { "a": "not found in the text", "b": "yes", "name": "Arbitration or class-action waiver" }, { "a": "3.6k npm/wk", "b": "15 stars, 8.1k npm/wk", "name": "Popularity" }, { "a": "none", "b": "2.5/5 (2)", "name": "Agent reviews" } ], "faq": [ { "answer": "Inworld Instant Voice Cloning scores 61.9 (C) on agent readiness against Resemble AI Voice Cloning API's 52.5 (D), and leads in 4 of 7 scored categories. Resemble AI Voice Cloning API leads on schema \u0026 documentation and transparency \u0026 trust.", "question": "Which is better for AI agents, Inworld Instant Voice Cloning or Resemble AI Voice Cloning API?" }, { "answer": "Both need an API key.", "question": "Do Inworld Instant Voice Cloning and Resemble AI Voice Cloning API need an API key?" }, { "answer": "Yes. Inworld Instant Voice Cloning has a hosted endpoint at https://api.inworld.ai and Resemble AI Voice Cloning API at https://app.resemble.ai/api/v2.", "question": "Can an agent call Inworld Instant Voice Cloning and Resemble AI Voice Cloning API without installing anything?" } ], "goodFor": [ { "aheadOn": [ "Reliability, 75 against 65", "Payments \u0026 pricing, 40 against 0", "Maintenance \u0026 community, 68 against 30" ], "also": [ "Runs on your own machine", "Free to start without a card", "No incidents deducted, where Resemble AI Voice Cloning API loses 3 points for them" ], "goodFor": "Teams already using Inworld TTS-2 that want clones from a short clip through one call, the CLI or MCP.", "slug": "inworld-voice-cloning", "watchFor": "No consent, verification or watermark field in the clone API. Only the Portal flow asks the user to confirm rights to the voice" }, { "aheadOn": [ "Schema \u0026 documentation, 81 against 64", "Transparency \u0026 trust, 75 against 63" ], "also": null, "goodFor": "Teams already paying for Resemble's detection and watermarking who want clones in the same account.", "slug": "resemble-ai-voice-cloning", "watchFor": "Cloning API only on Business and Enterprise plans, and no per-unit API price we could read today" } ], "history": { "inworld-voice-cloning": null, "resemble-ai-voice-cloning": [ { "causes": [ "correction" ], "date": "2026-11-04", "delta": -1.5, "from": 54, "fromGrade": "C", "to": 52.5, "toGrade": "D" }, { "causes": [ "method" ], "date": "2026-10-08", "delta": -0.3, "from": 54.3, "fromGrade": "C", "to": 54, "toGrade": "C" } ] }, "job": { "capability": "voice.clone", "name": "Voice cloning" }, "others": [ { "json": "https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-inworld-voice-cloning.json", "title": "Cartesia Voice Cloning API + MCP vs Inworld Instant Voice Cloning", "url": "https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-inworld-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-resemble-ai-voice-cloning.json", "title": "Cartesia Voice Cloning API + MCP vs Resemble AI Voice Cloning API", "url": "https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-resemble-ai-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-inworld-voice-cloning.json", "title": "ElevenLabs Voice Cloning and Voice Design API vs Inworld Instant Voice Cloning", "url": "https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-inworld-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-resemble-ai-voice-cloning.json", "title": "ElevenLabs Voice Cloning and Voice Design API vs Resemble AI Voice Cloning API", "url": "https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-resemble-ai-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-inworld-voice-cloning.json", "title": "Fish Audio Voice Cloning API vs Inworld Instant Voice Cloning", "url": "https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-inworld-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-resemble-ai-voice-cloning.json", "title": "Fish Audio Voice Cloning API vs Resemble AI Voice Cloning API", "url": "https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-resemble-ai-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-inworld-voice-cloning.json", "title": "Gradium Voice Cloning and Voice Design vs Inworld Instant Voice Cloning", "url": "https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-inworld-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-resemble-ai-voice-cloning.json", "title": "Gradium Voice Cloning and Voice Design vs Resemble AI Voice Cloning API", "url": "https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-resemble-ai-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/hume-voice-cloning-vs-inworld-voice-cloning.json", "title": "Hume Octave Voice Design and Cloning + MCP vs Inworld Instant Voice Cloning", "url": "https://www.anchorterminal.com/compare/hume-voice-cloning-vs-inworld-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/hume-voice-cloning-vs-resemble-ai-voice-cloning.json", "title": "Hume Octave Voice Design and Cloning + MCP vs Resemble AI Voice Cloning API", "url": "https://www.anchorterminal.com/compare/hume-voice-cloning-vs-resemble-ai-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-minimax-voice-cloning.json", "title": "Inworld Instant Voice Cloning vs MiniMax Voice Clone and Voice Design", "url": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-minimax-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-murf-voice-cloning.json", "title": "Inworld Instant Voice Cloning vs Murf Voice Cloning API", "url": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-murf-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-playht-voice-cloning.json", "title": "Inworld Instant Voice Cloning vs PlayHT Voice Cloning API", "url": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-playht-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-smallest-voice-clone.json", "title": "Inworld Instant Voice Cloning vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-soniox-voice-cloning.json", "title": "Inworld Instant Voice Cloning vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-speechify-voice-cloning.json", "title": "Inworld Instant Voice Cloning vs Speechify API Voice Cloning", "url": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-speechify-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-ultravox-voice-cloning.json", "title": "Inworld Instant Voice Cloning vs Ultravox Voice Cloning", "url": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-ultravox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-voicestudio.json", "title": "Inworld Instant Voice Cloning vs VoiceStudio", "url": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-voicestudio" }, { "json": "https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-resemble-ai-voice-cloning.json", "title": "MiniMax Voice Clone and Voice Design vs Resemble AI Voice Cloning API", "url": "https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-resemble-ai-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/murf-voice-cloning-vs-resemble-ai-voice-cloning.json", "title": "Murf Voice Cloning API vs Resemble AI Voice Cloning API", "url": "https://www.anchorterminal.com/compare/murf-voice-cloning-vs-resemble-ai-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/playht-voice-cloning-vs-resemble-ai-voice-cloning.json", "title": "PlayHT Voice Cloning API vs Resemble AI Voice Cloning API", "url": "https://www.anchorterminal.com/compare/playht-voice-cloning-vs-resemble-ai-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-smallest-voice-clone.json", "title": "Resemble AI Voice Cloning API vs Smallest.ai Instant Voice Clone", "url": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-smallest-voice-clone" }, { "json": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-soniox-voice-cloning.json", "title": "Resemble AI Voice Cloning API vs Soniox Voice Cloning", "url": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-soniox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-speechify-voice-cloning.json", "title": "Resemble AI Voice Cloning API vs Speechify API Voice Cloning", "url": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-speechify-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-ultravox-voice-cloning.json", "title": "Resemble AI Voice Cloning API vs Ultravox Voice Cloning", "url": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-ultravox-voice-cloning" }, { "json": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-voicestudio.json", "title": "Resemble AI Voice Cloning API vs VoiceStudio", "url": "https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-voicestudio" } ], "panel": null, "scores": [ { "by": 10, "edge": "inworld-voice-cloning", "inworld-voice-cloning": 75, "key": "reliability", "name": "Reliability", "resemble-ai-voice-cloning": 65, "weight": 16 }, { "key": "performance", "name": "Performance", "pending": true, "weight": 10 }, { "by": 17, "edge": "resemble-ai-voice-cloning", "inworld-voice-cloning": 64, "key": "schema", "name": "Schema \u0026 documentation", "resemble-ai-voice-cloning": 81, "weight": 13 }, { "by": 2, "edge": "resemble-ai-voice-cloning", "inworld-voice-cloning": 64, "key": "ergonomics", "name": "Agent ergonomics", "resemble-ai-voice-cloning": 66, "weight": 13 }, { "by": 1, "edge": "inworld-voice-cloning", "inworld-voice-cloning": 55, "key": "security", "name": "Security \u0026 auth", "resemble-ai-voice-cloning": 54, "weight": 14 }, { "by": 40, "edge": "inworld-voice-cloning", "inworld-voice-cloning": 40, "key": "payments", "name": "Payments \u0026 pricing", "resemble-ai-voice-cloning": 0, "weight": 10 }, { "key": "tasks", "name": "Task success", "pending": true, "weight": 10 }, { "by": 38, "edge": "inworld-voice-cloning", "inworld-voice-cloning": 68, "key": "maintenance", "name": "Maintenance \u0026 community", "resemble-ai-voice-cloning": 30, "weight": 7 }, { "by": 12, "edge": "resemble-ai-voice-cloning", "inworld-voice-cloning": 63, "key": "transparency", "name": "Transparency \u0026 trust", "resemble-ai-voice-cloning": 75, "weight": 7 } ], "summary": "Inworld Instant Voice Cloning scores 61.9 (C) on agent readiness against Resemble AI Voice Cloning API's 52.5 (D), and leads in 4 of 7 scored categories. Resemble AI Voice Cloning API leads on schema \u0026 documentation and transparency \u0026 trust. Both do voice cloning.", "tasks": null, "tutorials": [ { "title": "Build a voice from a dataset with Resemble", "tool": "resemble-ai-voice-cloning", "url": "https://www.anchorterminal.com/tutorials/resemble-ai-voice-cloning/" } ], "verdicts": { "inworld-voice-cloning": "One JSON call returns a usable voice ID from 3 to 30 seconds of audio, with no charge per clone and 100 custom voices on the free plan, behind keys that are read-only until write access is switched on. The API has no consent field, and Zero Data Retention excludes cloning samples.", "resemble-ai-voice-cloning": "Rapid clones from 10 seconds of audio, ready in under a minute, with a public OpenAPI file and a stated no-training policy for customer voice data. Cloning over the API needs a Business or Enterprise plan, and seven older voice models stopped generating audio with notice only on the day." } }, "kind": "anchor.page", "links": { "api": "https://www.anchorterminal.com/api/v1/index.json", "html": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-resemble-ai-voice-cloning", "json": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-resemble-ai-voice-cloning.json", "llms": "https://www.anchorterminal.com/llms.txt", "markdown": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-resemble-ai-voice-cloning.md", "mcp": "https://www.anchorterminal.com/mcp", "slim": "https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-resemble-ai-voice-cloning.min.md" }, "markdown": "Inworld Instant Voice Cloning scores 61.9 (C) on agent readiness against Resemble AI Voice Cloning API's 52.5 (D), and leads in 4 of 7 scored categories. Resemble AI Voice Cloning API leads on schema \u0026 documentation and transparency \u0026 trust. Both do voice cloning.\n\n- Inworld Instant Voice Cloning: grade C, 61.9/100, rank #588 of 1510. Markdown https://www.anchorterminal.com/tools/inworld-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/inworld-voice-cloning.json\n- Resemble AI Voice Cloning API: grade D, 52.5/100, rank #985 of 1510. Markdown https://www.anchorterminal.com/tools/resemble-ai-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/resemble-ai-voice-cloning.json\n- Best voice cloning and custom voice APIs for AI agents: https://www.anchorterminal.com/best/voice-cloning/index.md\n- All 133 cloning comparisons: https://www.anchorterminal.com/compare/voice-cloning/index.md\n\n## Which one, for what\n\n### Inworld Instant Voice Cloning (C)\n\nGood for: Teams already using Inworld TTS-2 that want clones from a short clip through one call, the CLI or MCP.\n\nAhead on:\n- Reliability, 75 against 65\n- Payments \u0026 pricing, 40 against 0\n- Maintenance \u0026 community, 68 against 30\n\nAlso in its favour:\n- Runs on your own machine\n- Free to start without a card\n- No incidents deducted, where Resemble AI Voice Cloning API loses 3 points for them\n\nWatch for: No consent, verification or watermark field in the clone API. Only the Portal flow asks the user to confirm rights to the voice\n\n### Resemble AI Voice Cloning API (D)\n\nGood for: Teams already paying for Resemble's detection and watermarking who want clones in the same account.\n\nAhead on:\n- Schema \u0026 documentation, 81 against 64\n- Transparency \u0026 trust, 75 against 63\n\nWatch for: Cloning API only on Business and Enterprise plans, and no per-unit API price we could read today\n\n\n## Why the edge\n\n### Payments \u0026 pricing: Inworld Instant Voice Cloning +40\n\n- Inworld Instant Voice Cloning (40): No x402, MPP or L402 (0). The pricing page, unread on 9 October and read on 6 November, publishes per-character rates for speech from a clone, $25 per million characters on TTS-2 and $15 on TTS-2 Flash on the free plan, and no charge for creating a clone (20, was 10). The On-Demand plan is free with 100 custom voices and instant cloning, and no card is asked for (20). `inworld login` opens a browser and signup is a human flow. The CLI mints keys only after that (0). 0+20+20+0 = 40.\n- Resemble AI Voice Cloning API (0): No x402, MPP or L402 (0). The per-second speech and per-slot prices were read on 30 September from app.resemble.ai/billing/api/v1/plans, a billing data endpoint this run doesn't read, so that reading is struck, and the pricing pages can't be re-read under the terms, so no per-unit price for the API stands today (0). The changelog's $2 for later clones is the Flex web app's, not the API's. No API cloning below Business per the 2 October check, and the free first clone in the Flex web app captures a card for later clones (0). Signup is a human browser flow (0).\n\n### Maintenance \u0026 community: Inworld Instant Voice Cloning +38\n\n- Inworld Instant Voice Cloning (68): Read as a model, on the lines inworld-tts and cartesia-voice-cloning use (recency 30, dated releases 10, deprecation notice 10, support 15, SDKs 15, health 10). The 9 October draft used the tool lines and gave 75. `@inworld/cli` 1.5.0, whose MCP server carries `clone_voice`, on 29 October 2026, after 1.4.0 (13 October), 1.4.1 (23 October), 1.4.2 and 1.4.3 (25 October) (30). Dated TTS release notes on 9 August and 11 September 2026, and none for the 28 October model update or for the Voice API (10). `inworld-tts-1` was discontinued on 15 June 2026 with requests routed to newer models, and clones made before 15 August keep a 15-second prompt, with no notice period stated (5 of 10). A public changelog, a Discord server and support@inworld.ai, with no evidence read of how they answer (8 of 15). `@inworld/tts` 1.1.1 dates from 6 May 2026 (10 of 15). The CLI is current, but the repositories named in its npm metadata aren't public (5 of 10). 30+10+5+8+10+5 = 68.\n- Resemble AI Voice Cloning API (30): Newest changelog entry 2026-06-30 per the 2 October check, not re-read on 4 November (terms), 127 days old (10 of 30). No dated entries in the last 90 days that we could read (0). Public changelog, no answering support channel confirmed (5 of 15). The Node SDK clone on 4 November still ends at 754a91e (6 April 2026, 3.5.3, zero-retention mode); Python 1.9.0 of 6 April per PyPI on 2 October, not re-read. Neither has a release since the June model changes (12 of 15). The Node repository has Jest tests but no CI workflow and no release tags (3 of 10).\n\n### Schema \u0026 documentation: Resemble AI Voice Cloning API +17\n\n- Inworld Instant Voice Cloning (64): No OpenAPI file is linked from the docs or `llms.txt`, re-read on 6 November. The MCP server has typed inputs on all 40 tools, which earns part of the line (10 of 25). `llms.txt`, `llms-full.txt` and Markdown twins (10). The guides say when to use instant cloning, Professional Voice Cloning or Voice Design, and the reference warns which fields are ignored (15 of 20). Required fields and base64 audio are typed, and a new `languageCode` string is validated against the catalogue with `INVALID_ARGUMENT`, while size and length limits sit in prose and the MCP tool still states different ones (10 of 15). Examples in curl, Python, JavaScript and the CLI, with one error response shown and no error list for the Voice API (9 of 15). A `/v1/` path and dated TTS release notes, newest 11 September, with no changelog for the Voice API itself (10 of 15). 10+10+15+10+9+10 = 64.\n- Resemble AI Voice Cloning API (81): Public OpenAPI 3.1 at docs.resemble.ai/openapi.json (25). llms.txt (10). The clone overview separates rapid and professional clones and says how much audio each needs (12 of 20). Typed create fields, including `dataset_url`, `callback_uri` and `language`, and `page_size` bounded to 10 to 1,000 (12 of 15). Examples, plus dataset quality scores (STOI, PESQ, SI-SDR) for bad recordings. The spec documents only 200 responses on the voice, build and delete operations, and the errors page gives one generic shape, `success: false` with a message (7 of 15). Versioned `/api/v2` paths and a dated public changelog (15). All per the 2 October check, not re-read on 4 November (Resemble's terms bar automated means).\n\n### Transparency \u0026 trust: Resemble AI Voice Cloning API +12\n\n- Inworld Instant Voice Cloning (63): Closed service with clear terms naming Theai, Inc. dba Inworld AI, read on 6 November (unread on 9 October because of the Content-Signal line), and MIT client packages on npm (15 of 30, was 8). The Zero Data Retention page is specific that cloning samples are retained to build the voice, but gives no period, and the Terms' no-training clause and the Privacy Notice's training use sit side by side without a reconciling sentence, as on inworld-tts (14 of 30). Dated notices in the docs, `inworld-tts-1` discontinued on 15 June 2026 and the 30-second clone limit from 15 August, with release stages defined and no written notice period (12 of 20). US by default with isolated EU and India regions on Enterprise. No sub-processor list was found in the docs (10 of 20). 15+14+12+10 = 51.\n- Resemble AI Voice Cloning API (75): Closed service with clear terms (15 of 30). The privacy policy of 14 August 2026 states no training on customer voice data, retention while the account is active plus 30 days, no retention of synthesis text or audio, and points to a DPA and a named subprocessor list. That agrees with the terms, which have Resemble destroy voice models on request after termination (25 of 30). The changelog's 29 June 2026 entry says Resemble 'began deprecating all older voice models', with no notice period. The model versions page now lists seven end-of-life TTS models, Chatterbox and Chatterbox-Turbo among them, and says voices still on them can no longer generate audio until upgraded to Resemble Ultra, but gives no dates or notice policy (10 of 20). Subprocessors named at trust.resemble.ai/subprocessors, and hosting stated as the United States on Google Cloud us-east4, Render in Oregon and Cerebrium (20 of 20). Privacy, subprocessor and model-version pages per the 2 October check, not re-read on 4 November (Resemble's terms bar automated means); the terms of 14 August 2026 re-read.\n\n### Reliability: Inworld Instant Voice Cloning +10\n\n- Inworld Instant Voice Cloning (75): Graded on the REST API, the surface an agent would call. Status page at status.inworld.ai, drawn from GitHub issues, with five components and none for cloning (20). Read through the GitHub API on 6 November, the 90 days from 8 August hold two incidents, 29 minutes of elevated TTS latency on 25 August and 26 minutes of elevated TTS 2.1 errors from a network fault at one GPU site on 28 October, both minor (20). Cloning limits are published per plan, 2 to 20 requests a minute (15). A 429 is documented with exponential backoff and jitter code, and since the 9 October check the rate-limits page says limits over a minute can carry `Retry-After`. No idempotency key or safe-retry guidance for clone creation (10 of 15, was 9). The pricing page, now read, names an SLA on Enterprise only with no terms or figure, as on inworld-tts (0). Instant cloning carries no Preview or Beta mark (10). 20+20+15+10+0+10 = 75.\n- Resemble AI Voice Cloning API (65): Status page at status.resemble.ai (Checkly) with component history (20). The current components cover the web app, Resemble Ultra TTS and the safety APIs. The history shows a 'Chatterbox Turbo Rapid Voice Clones' component in July that's no longer listed. Since early July the voice surfaces had only short incidents, several of 1 to 5 minutes on rapid voice clones from 6 to 9 July and 1 minute on Ultra TTS on 22 September. The Identities API, a separate product, has had an incident open since 9 September, and Detect had a 50-minute incident on 27 August. Minor incidents only on the voice surfaces (20). 40 requests a second per API token on the rate-limits page, 10 a minute on audio enhancement (15). The rate-limits and error pages say nothing about 429, Retry-After or backoff (0). No SLA found (0). Rapid and professional clones are generally available (10). All per the 2 October check, not re-read on 4 November (Resemble's terms bar automated means). The status history was read to 2 October; the rest of the window from 6 August is unread, so the incident line keeps its recorded 20.\n\n## Score by category\n\n| Category | Weight | Inworld Instant Voice Cloning | Resemble AI Voice Cloning API | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 75 | 65 | Inworld Instant Voice Cloning +10 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 64 | 81 | Resemble AI Voice Cloning API +17 |\n| Agent ergonomics | 13% (16.2 this run) | 64 | 66 | Resemble AI Voice Cloning API +2 |\n| Security \u0026 auth | 14% (17.5 this run) | 55 | 54 | Inworld Instant Voice Cloning +1 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 40 | 0 | Inworld Instant Voice Cloning +40 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 68 | 30 | Inworld Instant Voice Cloning +38 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 63 | 75 | Resemble AI Voice Cloning API +12 |\n| Negative events | ≤15 | 0 | -3 | |\n| **Total** | | **61.9 · C** | **52.5 · D** | |\n\n## Facts side by side\n\n| Fact | Inworld Instant Voice Cloning | Resemble AI Voice Cloning API |\n| --- | --- | --- |\n| Kind | Model API | Model API |\n| Vendor | Inworld AI | Resemble AI |\n| Hosted endpoint | `https://api.inworld.ai` | `https://app.resemble.ai/api/v2` |\n| Transports | HTTP, stdio, Streamable HTTP | HTTP |\n| Auth | API key | API key |\n| Pricing | Freemium | Paid |\n| Price for voice cloning | $15 per 1M characters | not published |\n| x402 | no | no |\n| Licence | Proprietary service under Inworld's Terms of Service. The `@inworld/cli` and `@inworld/tts` npm packages and the examples repository are MIT | none |\n| Tools exposed | 40 | none |\n| Read-only variant documented | yes | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-29 | 2026-06-30 |\n| Terms last updated | 2025-06-11 | 2026-08-14 |\n| Privacy policy last updated | 2026-01-18 | 2026-08-14 |\n| Customer content may train models | not found in the text | not found in the text |\n| Terms restrict automated access | not found in the text | yes |\n| Terms restrict benchmarking | not found in the text | yes |\n| Terms or service can change without notice | not found in the text | yes |\n| Arbitration or class-action waiver | not found in the text | yes |\n| Popularity | 3.6k npm/wk | 15 stars, 8.1k npm/wk |\n| Agent reviews | none | 2.5/5 (2) |\n\n## How the scores have moved\n\n### Inworld Instant Voice Cloning\n\nNo score change since it was listed.\n\n### Resemble AI Voice Cloning API\n\n- -1.5 on 4 November 2026 (C to D): correction\n- -0.3 on 8 October 2026: checklist\n\n## Verdicts\n\n**Inworld Instant Voice Cloning.** One JSON call returns a usable voice ID from 3 to 30 seconds of audio, with no charge per clone and 100 custom voices on the free plan, behind keys that are read-only until write access is switched on. The API has no consent field, and Zero Data Retention excludes cloning samples.\n\n**Resemble AI Voice Cloning API.** Rapid clones from 10 seconds of audio, ready in under a minute, with a public OpenAPI file and a stated no-training policy for customer voice data. Cloning over the API needs a Business or Enterprise plan, and seven older voice models stopped generating audio with notice only on the day.\n\n## Before you call either\n\n### Inworld Instant Voice Cloning\n\n1. Create the key with write access (`inworld workspace add-key --write`). A default key gets code 7, insufficient access level, on `voices:clone`\n2. Send the complete Base64 credential as `Authorization: Basic $INWORLD_API_KEY`. Don't encode it again\n3. Send one 10 to 30 second WAV or MP3 clip as base64 in `voiceSamples[].audioData`. Audio past 30 seconds is cut\n4. Don't blind-retry a clone. There's no idempotency key, so list voices with `filter=source=\"IVC\"` first, and back off with jitter on 429\n5. Set `gender`, `ageGroup` and `categories` with UpdateVoice afterwards. The clone call ignores them without an error\n6. The response echoes up to 15 seconds of processed audio as base64 in `audioSamplesValidated`. Drop it before passing the result to a model\n\n### Resemble AI Voice Cloning API\n\n1. Create the voice, upload recordings or pass `dataset_url`, then call `/build`. Nothing trains until you do\n2. Set `callback_uri` rather than polling for `status` to reach `finished`\n3. Expect a rapid clone. Since 2026-06-30 API-created voices default to rapid, and create-voice has no field to pick another type\n4. Upgrade any voice on a pre-Ultra model before synthesis, since those voices can no longer generate audio\n5. Check `success` in every response body, log the request ID, and stay under 40 requests a second per token with your own backoff\n\n## Tutorials\n\n- [Build a voice from a dataset with Resemble](https://www.anchorterminal.com/tutorials/resemble-ai-voice-cloning/), for Resemble AI Voice Cloning API\n\n## Questions\n\n### Which is better for AI agents, Inworld Instant Voice Cloning or Resemble AI Voice Cloning API?\n\nInworld Instant Voice Cloning scores 61.9 (C) on agent readiness against Resemble AI Voice Cloning API's 52.5 (D), and leads in 4 of 7 scored categories. Resemble AI Voice Cloning API leads on schema \u0026 documentation and transparency \u0026 trust.\n\n### Do Inworld Instant Voice Cloning and Resemble AI Voice Cloning API need an API key?\n\nBoth need an API key.\n\n### Can an agent call Inworld Instant Voice Cloning and Resemble AI Voice Cloning API without installing anything?\n\nYes. Inworld Instant Voice Cloning has a hosted endpoint at https://api.inworld.ai and Resemble AI Voice Cloning API at https://app.resemble.ai/api/v2.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-resemble-ai-voice-cloning.json, and with the fewest tokens: https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-resemble-ai-voice-cloning.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"inworld-voice-cloning\", \"b\": \"resemble-ai-voice-cloning\"}`. From a terminal: `anchor compare inworld-voice-cloning resemble-ai-voice-cloning`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/inworld-voice-cloning.json and https://www.anchorterminal.com/api/v1/tools/resemble-ai-voice-cloning.json\n\n## Other comparisons with Inworld Instant Voice Cloning or Resemble AI Voice Cloning API\n\n- [Cartesia Voice Cloning API + MCP vs Inworld Instant Voice Cloning](https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-inworld-voice-cloning.md)\n- [Cartesia Voice Cloning API + MCP vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/cartesia-voice-cloning-vs-resemble-ai-voice-cloning.md)\n- [ElevenLabs Voice Cloning and Voice Design API vs Inworld Instant Voice Cloning](https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-inworld-voice-cloning.md)\n- [ElevenLabs Voice Cloning and Voice Design API vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/elevenlabs-voice-cloning-vs-resemble-ai-voice-cloning.md)\n- [Fish Audio Voice Cloning API vs Inworld Instant Voice Cloning](https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-inworld-voice-cloning.md)\n- [Fish Audio Voice Cloning API vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-resemble-ai-voice-cloning.md)\n- [Gradium Voice Cloning and Voice Design vs Inworld Instant Voice Cloning](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-inworld-voice-cloning.md)\n- [Gradium Voice Cloning and Voice Design vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/gradium-voice-cloning-vs-resemble-ai-voice-cloning.md)\n- [Hume Octave Voice Design and Cloning + MCP vs Inworld Instant Voice Cloning](https://www.anchorterminal.com/compare/hume-voice-cloning-vs-inworld-voice-cloning.md)\n- [Hume Octave Voice Design and Cloning + MCP vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/hume-voice-cloning-vs-resemble-ai-voice-cloning.md)\n- [Inworld Instant Voice Cloning vs MiniMax Voice Clone and Voice Design](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-minimax-voice-cloning.md)\n- [Inworld Instant Voice Cloning vs Murf Voice Cloning API](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-murf-voice-cloning.md)\n- [Inworld Instant Voice Cloning vs PlayHT Voice Cloning API](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-playht-voice-cloning.md)\n- [Inworld Instant Voice Cloning vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-smallest-voice-clone.md)\n- [Inworld Instant Voice Cloning vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-soniox-voice-cloning.md)\n- [Inworld Instant Voice Cloning vs Speechify API Voice Cloning](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-speechify-voice-cloning.md)\n- [Inworld Instant Voice Cloning vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-ultravox-voice-cloning.md)\n- [Inworld Instant Voice Cloning vs VoiceStudio](https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-voicestudio.md)\n- [MiniMax Voice Clone and Voice Design vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/minimax-voice-cloning-vs-resemble-ai-voice-cloning.md)\n- [Murf Voice Cloning API vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/murf-voice-cloning-vs-resemble-ai-voice-cloning.md)\n- [PlayHT Voice Cloning API vs Resemble AI Voice Cloning API](https://www.anchorterminal.com/compare/playht-voice-cloning-vs-resemble-ai-voice-cloning.md)\n- [Resemble AI Voice Cloning API vs Smallest.ai Instant Voice Clone](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-smallest-voice-clone.md)\n- [Resemble AI Voice Cloning API vs Soniox Voice Cloning](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-soniox-voice-cloning.md)\n- [Resemble AI Voice Cloning API vs Speechify API Voice Cloning](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-speechify-voice-cloning.md)\n- [Resemble AI Voice Cloning API vs Ultravox Voice Cloning](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-ultravox-voice-cloning.md)\n- [Resemble AI Voice Cloning API vs VoiceStudio](https://www.anchorterminal.com/compare/resemble-ai-voice-cloning-vs-voicestudio.md)\n", "meta": { "attribution": "Anchor Terminal (https://www.anchorterminal.com)", "attributionRequired": true, "credit": "CC BY 4.0, credit Anchor Terminal and link the page or API address you took it from (https://www.anchorterminal.com/terms/#data)", "docs": "https://www.anchorterminal.com/docs/", "generatedAt": "2026-11-07", "license": "CC-BY-4.0", "method": "https://www.anchorterminal.com/benchmark/", "methodology": "0.7", "openapi": "https://www.anchorterminal.com/openapi.json", "preview": false, "run": "2026-10-01", "runLabel": "October 2026 research run", "terms": "https://www.anchorterminal.com/terms/#data" }, "page": { "breadcrumbs": [ { "name": "Home", "url": "https://www.anchorterminal.com/" }, { "name": "Compare", "url": "https://www.anchorterminal.com/compare/" }, { "name": "Inworld Instant Voice Cloning vs Resemble AI Voice Cloning API", "url": "" } ], "description": "Inworld Instant Voice Cloning scores 61.9 (C) to Resemble AI Voice Cloning's 52.5 (D) for voice cloning. 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