# Inworld Instant Voice Cloning vs Smallest.ai Instant Voice Clone (slim)

> Inworld Instant Voice Cloning scores 61.9 (C) to Smallest.ai Instant Voice Clone's 58 (C) for voice cloning. Inworld Instant Voice Cloning is cheaper for voice cloning, $15 against $17.50 per 1M characters. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-smallest-voice-clone.md (~5,600 tokens) · this version ~3,080 tokens · JSON https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-smallest-voice-clone.json · canonical https://www.anchorterminal.com/compare/inworld-voice-cloning-vs-smallest-voice-clone
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-07
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Inworld Instant Voice Cloning scores 61.9 (C) on agent readiness against Smallest.ai Instant Voice Clone's 58 (C), and leads in 4 of 7 scored categories. Smallest.ai Instant Voice Clone leads on schema & documentation and transparency & trust. Both do voice cloning. Inworld Instant Voice Cloning is cheaper for voice cloning, $15 against $17.50 per 1M characters.

- Inworld Instant Voice Cloning: C 61.9, rank #585 of 1486 · https://www.anchorterminal.com/tools/inworld-voice-cloning.min.md
- Smallest.ai Instant Voice Clone: C 58, rank #768 of 1486 · https://www.anchorterminal.com/tools/smallest-voice-clone.min.md
- Inworld Instant Voice Cloning, good for Teams already using Inworld TTS-2 that want clones from a short clip through one call, the CLI or MCP. Ahead on Reliability, 75 against 65; Security & auth, 55 against 48; Payments & pricing, 40 against 20. Also Cheaper for voice cloning, $15 against $17.50 per 1M characters; Runs on your own machine; Free to start without a card.
- Smallest.ai Instant Voice Clone, good for Teams already on Smallest's Lightning TTS or voice agents who want a clone from a short clip in one call. Ahead on Schema & documentation, 70 against 64; Transparency & trust, 72 against 63.

| Category | Inworld Instant Voice Cloning | Smallest.ai Instant Voice Clone |
| --- | --- | --- |
| Reliability (16%) | 75 | 65 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 64 | 70 |
| Agent ergonomics (13%) | 64 | 62 |
| Security & auth (14%) | 55 | 48 |
| Payments & pricing (10%) | 40 | 20 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 68 | 72 |
| Transparency & trust (7%) | 63 | 72 |

| Fact (where they differ) | Inworld Instant Voice Cloning | Smallest.ai Instant Voice Clone |
| --- | --- | --- |
| Vendor | Inworld AI | Smallest, Inc. |
| Hosted endpoint | `https://api.inworld.ai` | `https://api.smallest.ai/waves/v1/voice-cloning` |
| Transports | HTTP, stdio, Streamable HTTP | HTTP |
| Pricing | Freemium | Pay per use |
| Price for voice cloning | $15 per 1M characters | $17.50 per 1M characters |
| Licence | Proprietary service under Inworld's Terms of Service. The `@inworld/cli` and `@inworld/tts` npm packages and the examples repository are MIT | Proprietary service under Smallest's Terms of Service. The `smallestai` Python SDK is on PyPI |
| Tools exposed | 40 | none |
| Read-only variant documented | yes | no |
| Terms last updated | 2025-06-11 | no date given |
| Privacy policy last updated | 2026-01-18 | no date given |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 3.6k npm/wk | none |

Why the edge:
- Payments & pricing, Inworld Instant Voice Cloning +20: 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.); Smallest.ai Instant Voice Clone 20 (No x402, MPP or L402 (0). Per-character TTS prices are public, about $0.175 per 10,000 characters on Lightning v3.1, but no price per clone is published and the models pricing table marks voice cloning No on pay as you go, against the docs (10). The agents pricing page states $10 in free credits, and whether a card is needed wasn't established (10 of 20). A person signs up in a browser and creates the key in the dashboard (0). 0+10+10+0 = 20.)
- Reliability, Inworld Instant Voice Cloning +10: 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.); Smallest.ai Instant Voice Clone 65 (Graded on the hosted cloning API with the hosted lines. status.smallest.ai is the vendor's own status page with components per region and a dated incident feed (20). The feed, read on 6 November, has dozens of automated outage alerts on the API components in the 90 days from 8 August, most a few minutes long, and a cluster across every API region from 13 to 17 September. The 60-day uptime bars read 99.790 per cent for API USA and 99.849 per cent for API Global. No single outage of an hour was found, but repeated wide outages read as one major episode (10). Rate limits are published for TTS (one concurrent request, 100 a minute on pay as you go), while the per-organisation clone limit has no number (10 of 15). The limits page says to handle 429 gracefully and the clone errors say to retry a timeout, with no Retry-After, backoff figures or idempotency key (5 of 15). The pricing table lists an Enterprise SLA of 99.99 per cent (10). Instant cloning carries no beta label (10). 20+10+10+5+10+10 = 65.)
- Transparency & trust, Smallest.ai Instant Voice Clone +9: 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.); Smallest.ai Instant Voice Clone 72 (Closed service with clear terms naming Smallest, Inc. under California law, effective 21 October 2026 (15 of 30). The Terms rule out training on customer content, the Privacy Policy (18 September 2026) gives retention criteria but no periods, and the Zero Data Retention page is specific about Enterprise options, with nothing on how long cloning samples are kept (16 of 30). A deprecation page with dated statuses (deprecated, rejects, removed, scheduled, retiring) and migration targets (16 of 20). Two regions named with locations. No sub-processor list was found and a DPA page exists unread (10 of 20). 15+16+16+10 = 57.)
- Security & auth, Inworld Instant Voice Cloning +7: Inworld Instant Voice Cloning 55 (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.); Smallest.ai Instant Voice Clone 48 (Graded for voice cloning as the other listings in this category, 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. Plain bearer keys, shown once, revocable, with rotation guidance and no scopes. Short-lived access tokens are refused on the cloning endpoint (20 of 30). No consent or verification field. The Terms let Smallest demand proof that the speaker authorised a clone and remove voices without it, and the prohibited use policy bars unauthorised impersonation. No watermark found (6 of 20). The Terms say Smallest won't use User Content or Input to train its services. Zero retention and retention windows are Enterprise options, and no retention period for samples is published (9 of 15). A usage dashboard, with no audit log found (5 of 15). A valid security.txt naming security@smallest.ai and a HIPAA business associate agreement page. The trust centre didn't answer through our proxy, so no certification was confirmed first-hand, and no bug bounty was found (8 of 20). 20+6+9+5+8 = 48.)
- Schema & documentation, Smallest.ai Instant Voice Clone +6: 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.); Smallest.ai Instant Voice Clone 70 (The API reference pages are generated with typed fields, enums and error schemas, but no OpenAPI file was found linked from the docs or llms.txt (5 of 25). llms.txt and a Markdown copy of every page (10). The guide says when to use the Pro pool, how to check `modelIds` before synthesis and why a mismatched clone returns empty audio, while the reference still names the retiring default (14 of 20). `model` and `language` are enums validated by the server, with required `displayName` and `file`, a 5 MB limit and MIME types listed, and `tags` as a comma-separated string (12 of 15). Examples in curl, Python and Node.js and a table of seven error cases with causes (14 of 15). Paths under `/v1`, a deprecation page with dated statuses and a models changelog with entries on 21, 24, 26, 28 and 29 October 2026 (15). 5+10+14+12+14+15 = 70.)

| Task | Inworld Instant Voice Cloning | Smallest.ai Instant Voice Clone |
| --- | --- | --- |
| Narrate a 9,000-character script | $0.13 to $0.22 | $0.16 to $0.18 |