{ "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" }, "tool": { "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": 585, "ranked": true, "rankOf": 1486, "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" ], "breakdown": [ { "key": "reliability", "name": "Reliability", "weight": 16, "effectiveWeight": 20, "score": 75, "points": 15, "reason": "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.", "checked": "2026-11-06" }, { "key": "performance", "name": "Performance", "weight": 10, "effectiveWeight": 0, "pending": true, "points": 0, "reason": "Pending. Latency is measured per call by our probes, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until the first probe window closes." }, { "key": "schema", "name": "Schema \u0026 documentation", "weight": 13, "effectiveWeight": 16.25, "score": 64, "points": 10.4, "reason": "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.", "checked": "2026-11-06" }, { "key": "ergonomics", "name": "Agent ergonomics", "weight": 13, "effectiveWeight": 16.25, "score": 64, "points": 10.4, "reason": "The clone response echoes up to 15 seconds of processed audio as base64 with no way to leave it out. The MCP tool returns a compact result, but the server loads 40 tools with no toolsets, registering only those the credentials can call (13 of 25). Voice lists take an AIP-160 `filter`, `pageSize`, `pageToken` and `orderBy`, including `source = \"IVC\"`, and a capacity endpoint reports used and maximum custom voices (20). Errors are a numeric code, a message and details, and the one example reads clearly, but no list is documented for the Voice API (12 of 20). No idempotency key, no MCP annotations in the 1.5.0 package, and the SDKs retry 5xx and network errors twice by default (4 of 20). Two required fields, language auto-detection, and official Python and Node.js SDKs (15). 13+20+12+4+15 = 64.", "checked": "2026-11-06" }, { "key": "security", "name": "Security \u0026 auth", "weight": 14, "effectiveWeight": 17.5, "score": 55, "points": 9.63, "reason": "Graded for voice cloning as the other listings in this category were, with consent and misuse controls in place of the read-only line and training and retention of voice data in place of the prompt-injection line. Revocable workspace keys that are read-only for the Voice API until a write toggle is set, Realtime-only keys and single-use tokens, sent in a header (25 of 30). The API has no consent or verification field and no watermark was found. Only the Portal asks the user to confirm rights, and the Terms (11 June 2025), now read, have no clause on cloned voices. The write toggle keeps a default key from cloning (6 of 20). The Terms say Inworld won't train generally available models on non-public Materials except feedback and trust and safety content, while the Privacy Notice lists training among its uses. Zero Data Retention excludes cloning samples and no retention period for them is published (7 of 15, was 4). Usage is attributed per key in the dashboard and an experimental usage records endpoint exists from the Builder plan. No audit log found (7 of 15). GDPR and SOC 2 Type II are stated on every plan on the pricing page, and the security page links a vulnerability report form. No security.txt (404 per the 30 October inworld-tts check) and no bug bounty found (10 of 20, was 8). 25+6+7+7+10 = 55.", "checked": "2026-11-06" }, { "key": "payments", "name": "Payments \u0026 pricing", "weight": 10, "effectiveWeight": 12.5, "score": 40, "points": 5, "reason": "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.", "checked": "2026-11-06" }, { "key": "tasks", "name": "Task success", "weight": 10, "effectiveWeight": 0, "pending": true, "points": 0, "reason": "Pending. Task success needs the category task suites run through each tool, which haven't run yet, so this run doesn't score it. Its weight is shared across the assessed categories until then. A data provider's data-quality score is published on its listing now and becomes half of this category when it's scored." }, { "key": "maintenance", "name": "Maintenance \u0026 community", "weight": 7, "effectiveWeight": 8.75, "score": 68, "points": 5.95, "reason": "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.", "checked": "2026-11-06" }, { "key": "transparency", "name": "Transparency \u0026 trust", "weight": 7, "effectiveWeight": 8.75, "score": 63, "points": 5.51, "note": "editorial 51, provenance 75", "reason": "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.", "checked": "2026-11-06" } ], "assessment": { "date": "2026-11-06", "basis": "public evidence", "confidence": "medium", "notes": { "ergonomics": "The clone response echoes up to 15 seconds of processed audio as base64 with no way to leave it out. The MCP tool returns a compact result, but the server loads 40 tools with no toolsets, registering only those the credentials can call (13 of 25). Voice lists take an AIP-160 `filter`, `pageSize`, `pageToken` and `orderBy`, including `source = \"IVC\"`, and a capacity endpoint reports used and maximum custom voices (20). Errors are a numeric code, a message and details, and the one example reads clearly, but no list is documented for the Voice API (12 of 20). No idempotency key, no MCP annotations in the 1.5.0 package, and the SDKs retry 5xx and network errors twice by default (4 of 20). Two required fields, language auto-detection, and official Python and Node.js SDKs (15). 13+20+12+4+15 = 64.", "maintenance": "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.", "payments": "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.", "reliability": "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.", "schema": "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.", "security": "Graded for voice cloning as the other listings in this category were, with consent and misuse controls in place of the read-only line and training and retention of voice data in place of the prompt-injection line. Revocable workspace keys that are read-only for the Voice API until a write toggle is set, Realtime-only keys and single-use tokens, sent in a header (25 of 30). The API has no consent or verification field and no watermark was found. Only the Portal asks the user to confirm rights, and the Terms (11 June 2025), now read, have no clause on cloned voices. The write toggle keeps a default key from cloning (6 of 20). The Terms say Inworld won't train generally available models on non-public Materials except feedback and trust and safety content, while the Privacy Notice lists training among its uses. Zero Data Retention excludes cloning samples and no retention period for them is published (7 of 15, was 4). Usage is attributed per key in the dashboard and an experimental usage records endpoint exists from the Builder plan. No audit log found (7 of 15). GDPR and SOC 2 Type II are stated on every plan on the pricing page, and the security page links a vulnerability report form. No security.txt (404 per the 30 October inworld-tts check) and no bug bounty found (10 of 20, was 8). 25+6+7+7+10 = 55.", "transparency": "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." }, "sources": [ { "what": "instant voice cloning guide", "url": "https://docs.inworld.ai/tts/instant-voice-cloning.md", "seen": "2026-11-06" }, { "what": "clone endpoint reference", "url": "https://docs.inworld.ai/api-reference/voiceAPI/voiceservice/clone-voice.md", "seen": "2026-11-06" }, { "what": "API keys and write permissions", "url": "https://docs.inworld.ai/portal/api-keys.md", "seen": "2026-11-06" }, { "what": "rate limits, 429 and Retry-After", "url": "https://docs.inworld.ai/resources/rate-limits.md", "seen": "2026-11-06" }, { "what": "plans, cloning limits by plan and character counting", "url": "https://docs.inworld.ai/portal/billing.md", "seen": "2026-11-06" }, { "what": "pricing, custom voices per plan, SLA row", "url": "https://inworld.ai/pricing", "seen": "2026-11-06" }, { "what": "Terms of Service, 11 June 2025", "url": "https://inworld.ai/terms", "seen": "2026-11-06" }, { "what": "zero data retention scope", "url": "https://docs.inworld.ai/portal/zero-data-retention.md", "seen": "2026-11-06" }, { "what": "TTS release notes", "url": "https://docs.inworld.ai/release-notes/tts.md", "seen": "2026-11-06" }, { "what": "CLI, MCP server and telemetry", "url": "https://docs.inworld.ai/developer-tools/inworld-cli.md", "seen": "2026-11-06" }, { "what": "docs index for agents", "url": "https://docs.inworld.ai/llms.txt", "seen": "2026-11-06" }, { "what": "status incidents as GitHub issues", "url": "https://api.github.com/repos/inworld-ai/inworld-issue-status/issues?state=all", "seen": "2026-11-06" }, { "what": "TTS incident, 28 October 2026", "url": "https://github.com/inworld-ai/inworld-issue-status/issues/37", "seen": "2026-11-06" }, { "what": "CLI versions and the MCP tool definitions in the 1.5.0 package", "url": "https://registry.npmjs.org/@inworld/cli", "seen": "2026-11-06" }, { "what": "robots.txt with the Content-Signal line", "url": "https://inworld.ai/robots.txt", "seen": "2026-11-06" } ], "openQuestions": [ "Changed since the 9 October draft (held then only for Content-Signal ai-input=no). The pricing page and terms were read, no charge per clone and 100 free custom voices were confirmed, the 429 guidance now mentions Retry-After, `@inworld/cli` moved from 1.3.1 to 1.5.0 with the same 40 tools, one more minor incident (28 October), and the slug is inworld-voice-cloning in place of inworld-instant-voice-cloning, matching cartesia-voice-cloning and the other listings in the category.", "unchecked: whether cloning samples are used to train models. The Terms rule out training on non-public Materials with two exceptions, and the docs don't say how that applies to samples", "unchecked: the trust centre for the SOC 2 report and any sub-processor list", "The repositories named in npm metadata (inworld-ai/inworld-cli, inworld-ai/inworld-tts-node) are not public, so the MCP tool definitions were read from the published 1.5.0 package and not run", "Whether the API size limit for a sample is 12 MB as the Portal guide says or 4 MB as the MCP tool says", "inworld.ai/terms is the version effective 11 June 2025, while ultravox.ai carries Inworld AI Terms effective 1 October 2026 after Inworld took over Ultravox (per the inworld-tts check). Which version governs wasn't established." ] }, "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 }, "scoreHistory": [ { "date": "2026-11-06", "grade": "C", "kind": "listed", "method": "0.7", "score": 61.9 } ] }, "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" ], "notable": [ "Inworld's pricing page lists instant voice cloning and voice design on every plan, including the free On-Demand plan with 100 custom voices, and no charge per clone (https://inworld.ai/pricing)", "The 30-second prompt limit applies to voices cloned on or after 15 August 2026. Older clones keep a 15-second prompt until re-cloned (https://docs.inworld.ai/tts/instant-voice-cloning)", "Zero Data Retention lists Voice Cloning audio samples as not eligible, and is an Enterprise add-on (https://docs.inworld.ai/portal/zero-data-retention)", "The MCP server in `@inworld/cli` 1.5.0 (29 October 2026) registers 40 tools, `clone_voice`, `design_voice` and `publish_voice` among them, and sets no readOnlyHint or destructiveHint on any (https://registry.npmjs.org/@inworld/cli)", "The MCP `clone_voice` description still says about 5 seconds and 4 MB a sample, while the docs say 3 seconds and 12 MB (https://registry.npmjs.org/@inworld/cli/-/cli-1.5.0.tgz)", "status.inworld.ai is drawn from GitHub issues in inworld-ai/inworld-issue-status, with five components and none for cloning (https://github.com/inworld-ai/inworld-issue-status/issues)", "Professional Voice Cloning (10 minutes of audio or more, asynchronous training) is marked Beta and is not graded here (https://docs.inworld.ai/tts/professional-voice-cloning)" ], "area": "voice", "details": [ { "label": "Surface listed", "value": "Inworld's Voice API cloning endpoints at https://api.inworld.ai, read from docs.inworld.ai, the pricing and terms pages on inworld.ai, the status page's GitHub issues and the published `@inworld/cli` 1.5.0 package on 6 November 2026. No account was created and no API call was made" }, { "label": "Sample length", "value": "3 seconds minimum, 30 seconds used. The reference recommends 10 to 30 seconds. WAV or MP3 through the API, also webm in the Portal, 12 MB maximum" }, { "label": "Instant or professional", "value": "Instant is synchronous and generally available. Professional Voice Cloning is Beta, needs 10 minutes of audio and trains asynchronously" }, { "label": "Voice design", "value": "Yes, `POST /voices/v1/voices:design` from a text description, then `:publish`. Same rate limits as cloning" }, { "label": "Consent and verification", "value": "The Portal asks the user to confirm rights to clone the voice. The API request has no consent or verification field. No watermarking found in the docs" }, { "label": "Voice ownership", "value": "The docs say the creator stays owner of a voice shared to the Voice Library and grants Inworld a licence to host and distribute it. The Terms of Service (11 June 2025) have no clause specific to cloned voices or consent" }, { "label": "Endpoints", "value": "`POST /voices/v1/voices:clone`, `GET /voices/v1/voices`, `GET`, `PATCH` and `DELETE /voices/v1/voices/{voiceId}`, `GET /voices/v1/voices:customVoiceCapacity`, and copy tokens to move a voice between workspaces, on `https://api.inworld.ai`" }, { "label": "Models", "value": "Clones work on `inworld-tts-2` and `inworld-tts-2-flash`" }, { "label": "Rate limits", "value": "Voice cloning API requests a minute. On-Demand 2, Creator 3, Builder 5, Developer 10, Growth 20, Enterprise custom, per account across all keys" }, { "label": "Credentials", "value": "Workspace API key sent as HTTP Basic. Voice write access is an opt-in toggle per key. Deleting a key revokes it and every token minted from it" }, { "label": "Free tier", "value": "On-Demand plan is free with up to 70 minutes of TTS and 100 custom voices, and the docs say instant cloning is open to all users. Professional voice clones need a payment method on file" }, { "label": "Data retention", "value": "Cloning samples are kept to build and support the voice. Zero Data Retention does not cover them. No retention period published in the docs" }, { "label": "Regions", "value": "US by default. Isolated EU and India deployments for Enterprise, with voices and keys separate per region" }, { "label": "SDKs and tools", "value": "`@inworld/tts` 1.1.1 (npm, MIT, 6 May 2026), `inworld-tts` (PyPI), `@inworld/cli` 1.5.0 with the `inworld-mcp` server (npm, MIT, Node.js 20 or later)" }, { "label": "Custom voices", "value": "Cloned and designed voices share one limit per account. On-Demand 100, Creator 500, Builder 3,000, Developer 10,000, Growth 30,000, Enterprise custom, per the pricing page" } ], "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" } ], "taskCosts": { "units": [ { "task": "narrate-script", "name": "Narrate a 9,000-character script", "unit": "1m-chars", "quantity": 0.009, "lowUsd": 0.13, "highUsd": 0.22, "lowItem": "Speech from a clone, TTS-2 Flash, On-Demand", "highItem": "Speech from a clone, TTS-2, On-Demand" } ], "note": "The quantity times this listing's own unit price, its cheapest item to its dearest. Plans, minimums and free allowances aren't counted." }, "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, "checks": [ { "check": "Legal entity named", "value": "Theai, Inc. dba Inworld AI", "points": 20, "max": 20, "state": "ok" }, { "check": "Domain age", "value": "inworld.ai, no registry record we could read", "points": 0, "max": 15, "state": "no" }, { "check": "Endpoint on the vendor's domain", "value": "api.inworld.ai", "points": 15, "max": 15, "state": "ok" }, { "check": "Terms of service", "value": "read, states 6 of the 7 things a reader expects", "points": 9.1, "max": 10, "state": "part" }, { "check": "Privacy policy", "value": "read, states 7 of the 8 things a reader expects", "points": 9.3, "max": 10, "state": "part" }, { "check": "Status page", "value": "status.inworld.ai", "points": 10, "max": 10, "state": "ok" }, { "check": "Changelog", "value": "published", "points": 10, "max": 10, "state": "ok" }, { "check": "security.txt", "value": "not found", "points": 0, "max": 10, "state": "no" }, { "check": "People named", "value": "3 named with their role, none with a public profile", "points": 7, "max": 10, "state": "part" }, { "check": "Support route", "value": "a support address, help pages, a community", "points": 5, "max": 5, "state": "ok" } ], "policies": [ { "kind": "terms", "url": "https://inworld.ai/terms", "state": "read", "readAt": "2026-10-30", "statedDate": "2025-06-11", "words": 2623, "points": 9.1, "max": 10, "expected": [ { "key": "terms.date", "label": "Gives the date it was last updated", "found": true, "quote": "Effective Date: June 11, 2025", "says": "Last updated 2025-06-11" }, { "key": "terms.law", "label": "Names the governing law or courts", "found": true, "quote": "Except as provided in the dispute resolution section above, all claims arising out of or relating to these Terms will be brought exclusively in the federal or state courts of Santa Clara, California.", "says": "Disputes go to the courts of Santa Clara, California" }, { "key": "terms.liability", "label": "States a limit on its liability", "found": true, "quote": "OUR AGGREGATE LIABILITY UNDER THESE TERMS WILL NOT EXCEED THE GREATER OF: (A) THE AMOUNT YOU PAID FOR THE SERVICE THAT GAVE RISE TO THE CLAIM DURING THE 12 MONTHS BEFORE THE LIABILITY AROSE OR (B) ONE HUNDRED DOLLARS ($100).", "says": "Capped at the greater of $100 and the fees paid in the 12 months before the claim" }, { "key": "terms.termination", "label": "Says how the agreement or account can be ended", "found": true, "quote": "If your payment cannot be completed, we may downgrade your account or suspend your access to our Services until payment is received." }, { "key": "terms.changes", "label": "Says how changes to the terms are announced", "found": true, "quote": "If we increase our subscription prices, we will give you at least 30 days' notice and any price increase will take effect on your next renewal so that you can cancel if you do not agree to the price increase.", "says": "Gives 30 days of notice before a change" }, { "key": "terms.use", "label": "Lists what users may not do", "found": true, "quote": "YOU ACCEPT AND AGREE THAT ANY USE OF OUTPUTS FROM OUR SERVICE IS AT YOUR SOLE RISK AND YOU WILL NOT RELY ON OUTPUT AS A SOURCE OF TRUTH OR FACTUAL INFORMATION, OR AS A SUBSTITUTE FOR PROFESSIONAL ADVICE." }, { "key": "terms.sla", "label": "Refers to a service level or uptime commitment", "found": false } ] }, { "kind": "privacy", "url": "https://inworld.ai/privacy", "state": "read", "readAt": "2026-10-30", "statedDate": "2026-01-18", "words": 3236, "points": 9.3, "max": 10, "expected": [ { "key": "privacy.date", "label": "Gives the date it was last updated", "found": true, "quote": "Last Updated: January 18, 2026", "says": "Last updated 2026-01-18" }, { "key": "privacy.collected", "label": "Says what personal data is collected", "found": true, "quote": "This Privacy Notice applies to information we collect when you access or use our websites and any related services (collectively, the “Services”), or when you otherwise interact with us, such as through our customer support channels." }, { "key": "privacy.retention", "label": "Says how long data is kept", "found": true, "quote": "We store personal information for as long as necessary to carry out the purposes for which we originally collected it, satisfy our legal requirements, or for other business purposes explained in this Privacy Notice.", "says": "For as long as needed, with no period named" }, { "key": "privacy.processors", "label": "Says who else receives the data", "found": true, "quote": "Vendors: we disclose information to vendors, service providers, contractors and consultants that need this information to provide services to us, such as companies that assist us with web hosting, payment processing, fraud prevention, customer service, data enrichment, analytics, and marketing and advertising." }, { "key": "privacy.sale", "label": "Says whether personal data is sold or shared for advertising", "found": true, "quote": "You can also adjust certain cookie settings by selecting “Do Not Sell or Share My Personal Information” within the cookie icon at the bottom-left corner of our website.", "says": "Says it does not sell personal data" }, { "key": "privacy.rights", "label": "Says what rights people have over their data", "found": true, "quote": "You have the right to opt out of sharing, sales, and targeted advertising by:" }, { "key": "privacy.contact", "label": "Gives a privacy contact", "found": true, "quote": "Depending on where you reside, you may opt out of these disclosures by emailing privacy@inworld.ai.", "says": "privacy@inworld.ai" }, { "key": "privacy.transfers", "label": "Says where data is transferred or stored", "found": false } ], "toKnow": [ { "key": "privacy.sells", "label": "Says it sells personal data or shares it for advertising", "found": true, "quote": "Some of the activities described in this section may constitute “targeted advertising,” “sharing,” or “selling” under certain laws." } ] } ] }, "humans": { "slug": "inworld-voice-cloning", "checked": "2026-11-06", "company": "Inworld AI (Theai, Inc.)", "people": [ { "name": "Kylan Gibbs", "role": "Co-founder and CEO", "founder": true, "page": "/people/kylan-gibbs/" }, { "name": "Ilya Gelfenbeyn", "role": "Co-founder", "founder": true, "page": "/people/ilya-gelfenbeyn/" }, { "name": "Michael Ermolenko", "role": "Co-founder", "founder": true, "page": "/people/michael-ermolenko/" } ], "peopleNote": "Copied from the inworld-tts humans file (checked 30 October 2026), the same company, on 6 November 2026 without new research. Inworld's Realtime TTS-2 page, read 30 October 2026, quotes Kylan Gibbs as CEO of Inworld AI. Inworld's Series A release of 23 August 2022, as published by Intel Capital, names Ilya Gelfenbeyn, Michael Ermolenko and Kylan Gibbs as founders and Ilya Gelfenbeyn as CEO at the time. No about or team page was found in the inworld.ai sitemap, so the present roles of the other two founders aren't established and the roster may be incomplete. No personal accounts are linked from Inworld's pages, so none are listed. The 28 October 2026 Reasoning post is signed by the Inworld TTS team. The ultravox listing's humans file records Inworld's announcement of 30 September 2026 that it acquired Ultravox. Investors come from the Series A release as published by Intel Capital and from The SaaS News report of the August 2023 round led by Lightspeed. Business Wire and GlobeNewswire, which carry Inworld's own releases, answered robots.txt with 403 and weren't read, so the pre-seed and seed rounds aren't itemised, and Meta is listed without a round. TechCrunch's report of 2 August 2023, read 6 November 2026, says Lightspeed invested more than $50 million in the latest tranche, \"bringing Inworld’s total raised to more than $100 million at a $500 million post-money valuation\", and mentions investments from Disney as part of the 2022 Disney Accelerator; that gives the valuation, the total raised and Disney below. The same report's grant from Epic isn't equity and isn't listed. No later round was found. On 6 November 2026 the ownership and investors were aligned with inworld-realtime, sourced to GamesBeat, since techcrunch.com's robots.txt disallows ClaudeBot.", "companySocial": { "linkedin": "https://www.linkedin.com/company/inworld-ai", "x": "https://x.com/inworld", "github": "https://github.com/inworld-ai" }, "support": { "emails": [ "support@inworld.ai" ], "urls": [ "https://docs.inworld.ai/portal/support", "https://docs.inworld.ai/" ], "community": [ { "label": "Inworld Discord", "url": "https://discord.gg/inworld", "kind": "discord" } ], "contactUrls": [ "https://inworld.ai/contact-sales", "https://inworld.ai/report-security-vulnerability" ] }, "sources": [ "https://inworld.ai/blog/realtime-tts-2", "https://inworld.ai/blog/realtime-tts-2-reasoning-speed-consistency", "https://inworld.ai/pricing", "https://inworld.ai/terms", "https://inworld.ai/security", "https://inworld.ai/sitemap.xml", "https://docs.inworld.ai/portal/support.md", "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/" ], "ownership": { "status": "private", "totalRaised": { "amount": "over $100M", "asOf": "2023-08", "source": "https://gamesbeat.com/inworld-ai-raises-new-round-at-500m-valuation-for-ai-game-characters/" }, "valuation": { "amount": "over $500M", "basis": "stated", "round": "August 2023 round led by Lightspeed", "asOf": "2023-08", "source": "https://gamesbeat.com/inworld-ai-raises-new-round-at-500m-valuation-for-ai-game-characters/" }, "checked": "2026-11-06", "sources": [ "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "https://www.thesaasnews.com/news/inworld-ai-raises-50-million-in-funding", "https://inworld.ai/terms", "https://gamesbeat.com/inworld-ai-raises-new-round-at-500m-valuation-for-ai-game-characters/" ] }, "investors": [ { "name": "Section 32", "kind": "vc", "rounds": [ "Series A, August 2022" ], "lead": true, "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "Section 32 and Intel Capital led the round", "page": "/investors/section-32/" }, { "name": "Intel Capital", "firm": "Intel", "kind": "corporate", "rounds": [ "Series A, August 2022" ], "lead": true, "url": "https://www.intelcapital.com", "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "Section 32 and Intel Capital led the round", "page": "/investors/intel/" }, { "name": "Lightspeed Venture Partners", "kind": "vc", "rounds": [ "August 2023 round" ], "lead": true, "url": "https://lsvp.com", "source": "https://www.thesaasnews.com/news/inworld-ai-raises-50-million-in-funding", "quote": "The round was led by Lightspeed Venture Partners.", "page": "/investors/lightspeed-venture-partners/" }, { "name": "Founders Fund", "kind": "vc", "rounds": [ "Series A, August 2022" ], "url": "https://foundersfund.com", "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "which also included investments from Founders Fund, Accelerator Investments LLC, First Spark Ventures, Kleiner Perkins, BITKRAFT Ventures, CRV, Microsoft’s M12 fund, Micron Ventures, LG Technology Ventures, SK Telecom Venture Capital, The Venture Reality Fund, and HTC", "page": "/investors/founders-fund/" }, { "name": "Accelerator Investments LLC", "kind": "other", "rounds": [ "Series A, August 2022" ], "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "which also included investments from Founders Fund, Accelerator Investments LLC, First Spark Ventures", "page": "/investors/accelerator-investments-llc/" }, { "name": "First Spark Ventures", "kind": "vc", "rounds": [ "Series A, August 2022", "August 2023 round" ], "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "which also included investments from Founders Fund, Accelerator Investments LLC, First Spark Ventures", "page": "/investors/first-spark-ventures/" }, { "name": "Kleiner Perkins", "kind": "vc", "rounds": [ "Series A, August 2022" ], "url": "https://www.kleinerperkins.com", "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "First Spark Ventures, Kleiner Perkins, BITKRAFT Ventures, CRV", "page": "/investors/kleiner-perkins/" }, { "name": "BITKRAFT Ventures", "kind": "vc", "rounds": [ "Series A, August 2022" ], "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "First Spark Ventures, Kleiner Perkins, BITKRAFT Ventures, CRV", "page": "/investors/bitkraft-ventures/" }, { "name": "CRV", "kind": "vc", "rounds": [ "Series A, August 2022" ], "url": "https://www.crv.com", "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "First Spark Ventures, Kleiner Perkins, BITKRAFT Ventures, CRV", "page": "/investors/crv/" }, { "name": "M12", "firm": "Microsoft", "kind": "corporate", "rounds": [ "Series A, August 2022", "August 2023 round" ], "url": "https://m12.vc", "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "Microsoft’s M12 fund", "page": "/investors/microsoft/" }, { "name": "Micron Ventures", "firm": "Micron", "kind": "corporate", "rounds": [ "Series A, August 2022" ], "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "Microsoft’s M12 fund, Micron Ventures, LG Technology Ventures", "page": "/investors/micron/" }, { "name": "LG Technology Ventures", "firm": "LG", "kind": "corporate", "rounds": [ "Series A, August 2022", "August 2023 round" ], "url": "https://www.lgtechventures.com", "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "Micron Ventures, LG Technology Ventures, SK Telecom Venture Capital", "page": "/investors/lg/" }, { "name": "SK Telecom Venture Capital", "firm": "SK Telecom", "kind": "corporate", "rounds": [ "Series A, August 2022" ], "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "LG Technology Ventures, SK Telecom Venture Capital, The Venture Reality Fund, and HTC", "page": "/investors/sk-telecom/" }, { "name": "The Venture Reality Fund", "kind": "vc", "rounds": [ "Series A, August 2022" ], "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "SK Telecom Venture Capital, The Venture Reality Fund, and HTC", "page": "/investors/the-venture-reality-fund/" }, { "name": "HTC", "kind": "corporate", "rounds": [ "Series A, August 2022" ], "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "SK Telecom Venture Capital, The Venture Reality Fund, and HTC", "page": "/investors/htc/" }, { "name": "Meta", "kind": "corporate", "url": "https://www.meta.com", "source": "https://www.intelcapital.com/inworld-ai-closes-50m-series-a-to-populate-video-games-and-the-metaverse-with-interactive-ai-driven-characters/", "quote": "Inworld is funded by investors including Intel Capital, Section 32, Accelerator Investments LLC, Founders Fund, First Spark Ventures, The Venture Reality Fund, Micron Ventures, HTC, SK Telecom Venture Capital, Kleiner Perkins, BITKRAFT Ventures, CRV, Meta, and M12, Microsoft’s Venture Fund.", "page": "/investors/meta/" }, { "name": "Stanford University", "kind": "other", "rounds": [ "August 2023 round" ], "url": "https://www.stanford.edu", "source": "https://www.thesaasnews.com/news/inworld-ai-raises-50-million-in-funding", "quote": "Other significant contributors include Stanford University, Samsung Next, Microsoft's M12 fund, First Spark Ventures co-founded by Eric Schmidt, and LG Technology Ventures", "page": "/investors/stanford-university/" }, { "name": "Samsung Next", 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