# Fish Audio TTS API vs HeyGen Voice (slim)

> HeyGen Voice scores 71.3 (BB) to Fish Audio TTS's 60.7 (C) for text-to-speech. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/fish-audio-tts-vs-heygen-voice.md (~2,450 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/fish-audio-tts-vs-heygen-voice.json · canonical https://www.anchorterminal.com/compare/fish-audio-tts-vs-heygen-voice
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-10

HeyGen Voice scores 71.3 (BB) on agent readiness against Fish Audio TTS API's 60.7 (C), and leads in 4 of 7 scored categories. Both do text-to-speech.

- Fish Audio TTS API: C 60.7, rank #505 of 961 · https://www.anchorterminal.com/tools/fish-audio-tts.min.md
- HeyGen Voice: BB 71.3, rank #131 of 961 · https://www.anchorterminal.com/tools/heygen-voice.min.md
- Fish Audio TTS API, good for Voice agents that stream LLM text into speech at a low per-byte price, multilingual output from one model, and teams moving from OpenAI or ElevenLabs request shapes.
- HeyGen Voice, good for Speech in a voice cloned from one short recording, for agents that already make HeyGen videos or need a cloned narrator with streaming and timestamps. Ahead on Schema & documentation, 94 against 84; Agent ergonomics, 83 against 67; Security & auth, 69 against 35; Transparency & trust, 69 against 60. Also Agent-ready, a grade of BB or better.

| Category | Fish Audio TTS API | HeyGen Voice |
| --- | --- | --- |
| Reliability (16%) | 75 | 75 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 84 | 94 |
| Agent ergonomics (13%) | 67 | 83 |
| Security & auth (14%) | 35 | 69 |
| Payments & pricing (10%) | 30 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 69 | 65 |
| Transparency & trust (7%) | 60 | 69 |

| Fact (where they differ) | Fish Audio TTS API | HeyGen Voice |
| --- | --- | --- |
| Vendor | Fish Audio | HeyGen |
| Hosted endpoint | `https://api.fish.audio` | `https://api.heygen.com` |
| Transports | HTTP, Streamable HTTP | HTTP |
| Auth | OAuth or key | API key |
| Licence | Apache-2.0 (Python SDK), MIT (JavaScript SDK) | Closed service under HeyGen's Terms of Service (HeyGen Technology, Inc., last updated 23 July 2026). |
| Last release | 2026-09-23 | none |
| Terms last updated | 2024-08-18 |  |
| Privacy policy last updated | 2024-08-28 |  |
| Customer content may train models | yes |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | yes |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | yes |  |
| Popularity | 5.2k npm/wk, 34k PyPI/wk | none |