# Fish Audio Voice Cloning API vs Inworld Instant Voice Cloning (slim)

> Inworld Instant Voice Cloning and Fish Audio Voice Cloning score within a point of each other for voice cloning, 61.9 and 61.5 out of 100. Fish Audio Voice Cloning is cheaper for voice cloning, $0 against $15 per 1M characters. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-inworld-voice-cloning.md (~5,500 tokens) · this version ~2,930 tokens · JSON https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-inworld-voice-cloning.json · canonical https://www.anchorterminal.com/compare/fish-audio-voice-cloning-vs-inworld-voice-cloning
- 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
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Inworld Instant Voice Cloning and Fish Audio Voice Cloning API score within a point of each other on agent readiness, 61.9 (C) and 61.5 (C). Fish Audio Voice Cloning API leads on schema & documentation and agent ergonomics. Both do voice cloning. Fish Audio Voice Cloning API is cheaper for voice cloning, $0 against $15 per 1M characters.

- Fish Audio Voice Cloning API: C 61.5, rank #607 of 1510 · https://www.anchorterminal.com/tools/fish-audio-voice-cloning.min.md
- Inworld Instant Voice Cloning: C 61.9, rank #588 of 1510 · https://www.anchorterminal.com/tools/inworld-voice-cloning.min.md
- Fish Audio Voice Cloning API, good for Cheap, quick clones of your own voice and for prompt-designed voices at volume, now also from an MCP client. Ahead on Schema & documentation, 81 against 64; Agent ergonomics, 73 against 64. Also Cheaper for voice cloning, $0 against $15 per 1M characters.
- 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 Security & auth, 55 against 35; Payments & pricing, 40 against 30. Also Runs on your own machine; Free to start without a card.

| Category | Fish Audio Voice Cloning API | Inworld Instant Voice Cloning |
| --- | --- | --- |
| Reliability (16%) | 75 | 75 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 81 | 64 |
| Agent ergonomics (13%) | 73 | 64 |
| Security & auth (14%) | 35 | 55 |
| Payments & pricing (10%) | 30 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 72 | 68 |
| Transparency & trust (7%) | 61 | 63 |

| Fact (where they differ) | Fish Audio Voice Cloning API | Inworld Instant Voice Cloning |
| --- | --- | --- |
| Vendor | Fish Audio | Inworld AI |
| Hosted endpoint | `https://api.fish.audio` | `https://api.inworld.ai` |
| Transports | HTTP, Streamable HTTP | HTTP, stdio, Streamable HTTP |
| Pricing | Pay per use | Freemium |
| Price for voice cloning | free | $15 per 1M characters |
| Licence | Apache-2.0 (Python SDK) | Proprietary service under Inworld's Terms of Service. The `@inworld/cli` and `@inworld/tts` npm packages and the examples repository are MIT |
| Tools exposed | none | 40 |
| Read-only variant documented | no | yes |
| Last release | 2026-10-30 | 2026-10-29 |
| Terms last updated | 2024-08-18 | 2025-06-11 |
| Privacy policy last updated | 2024-08-28 | 2026-01-18 |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | yes | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 218 stars, 6.4k npm/wk, 37k PyPI/wk | 3.6k npm/wk |
| Agent reviews | 2.5/5 (2) | none |

Why the edge:
- Security & auth, Inworld Instant Voice Cloning +20: Fish Audio Voice Cloning API 35 (Graded for voice cloning, 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, since the API returns audio and IDs rather than third-party text. Plain revocable API keys with no scopes found. The MCP server signs in by OAuth and is bound to one team, with no scopes documented (20 of 30). The REST API has no consent field or speaker check on `POST /model` or inline `references`, only best-practice guidance to clone your own voice or one you have written permission for. The MCP server's `create_voice_clone` runs once the user confirms rights to the voice, and `verify_voice_clone` finishes clones that need speaker verification from a read passage, with no statement of when that applies. MCP clones are unlisted by default, so anyone with the ID can use them. Professional Voice Clone verification is in the web app only. No watermark or detection tool found (5 of 20). The terms (effective 18 August 2024) take a perpetual, irrevocable licence to submissions including for model training, with no opt-out, and the privacy policy (28 August 2024) keeps content as long as needed. Files staged through the MCP server are deleted after 7 days, which doesn't cover the clone (0 of 15). Credit and wallet usage readable through the API and `get_credit_balance` on the MCP server, no per-call log found (8 of 15). security.txt returned 404 on 23 October and no SOC 2, bug bounty or trust centre was found. The docs' contributing page asks for security reports by email without giving an address, which the fish-audio-tts listing credits at 2. This listing gave 0 on the same evidence, now aligned. No advisories for either SDK in OSV on 4 November (2 of 20). The pages are per the 23 October check, not re-read on 4 November. 20+5+0+8+2 = 35.); 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.)
- Schema & documentation, Fish Audio Voice Cloning API +17: Fish Audio Voice Cloning API 81 (Public OpenAPI 3.1 at docs.fish.audio/api-reference/openapi.json, re-read on 23 October with 39 paths (25). llms.txt and Markdown pages (10). The voice cloning guide says when to create a persistent model and when to pass reference audio inline (14 of 20). Inputs typed, with an enum for `visibility`, `train_mode` fixed to `fast`, 1 to 20 voice files, and ranges on every voice design field (14 of 15). Examples throughout, but the create-model reference still documents only 401 and 503 with a `{status, message, reason}` body (8 of 15). The changelog is now dated and current to 20 October 2026 and has S2.1 Pro (23 June 2026). It still has no entry for voice design or the model endpoints, and paths mix unversioned `/model` with `/v1` (10 of 15). The OpenAPI file, guides and changelog are per the 23 October check, not re-read on 4 November (fish.audio's terms forbid crawling). 25+10+14+14+8+10 = 81.); 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.)
- Payments & pricing, Inworld Instant Voice Cloning +10: Fish Audio Voice Cloning API 30 (No x402, MPP or L402 in the docs, the OpenAPI file or the pricing page (0). Per-unit prices published without a login and re-read on 23 October, $15 per million UTF-8 bytes of speech on `s2.1-pro`, $50 on `drama-3` ($10 until 12 November 2026) and $0.01 per successful voice design request, with no published fee to create a voice model. Cloning on the MCP server is free (20). The `s2.1-pro-free` model costs $0 under fair use, free through 30 November 2026 per the changelog. The card requirement isn't stated (10 of 20). Signup is a human browser flow, the API is prepaid and the MCP server signs in through a browser (0). 0+20+10+0 = 30.); 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.)
- Agent ergonomics, Fish Audio Voice Cloning API +9: Fish Audio Voice Cloning API 73 (Creating a model returns the model object with author and engagement fields, heavier than an ID and status (20 of 25). `GET /model` pages with `page_size` (1 to 100, default 10) and `page_number`, filters by `self` (the workspace's own voices), title, tag, language, author and `licensed`, and sorts three ways, read in the OpenAPI on 23 October (20). Errors carry a status, message and optional reason, without a catalogue of codes (10 of 20). No idempotency key on `POST /model`, but inline cloning needs no create step and voice design bills only successful requests, so a failed call can be retried at no cost. The 429 backoff guidance doesn't change this line (10 of 20). Official Python and JavaScript SDKs and a short required field list. Python `fish-audio-sdk` 1.4.0 (30 October 2026) accepts `s2.1-pro-free` and `drama-3`, while npm `fish-audio` stays at 0.1.0 (10 March 2026), defaulting speech to `s1`, deprecated on 8 October 2026 (13 of 15). The API readings are per the 23 October check, not re-read on 4 November. 20+20+10+10+13 = 73.); Inworld Instant Voice Cloning 64 (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.)

| Task | Fish Audio Voice Cloning API | Inworld Instant Voice Cloning |
| --- | --- | --- |
| Narrate a 9,000-character script | $0.13 to $0.45 | $0.13 to $0.22 |