# Fish Audio Voice Cloning API vs Ultravox Voice Cloning

> Fish Audio Voice Cloning API has a score of 51.5 (D) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is agent ergonomics, 30 points. Category scores, facts, verdicts and agent notes side by side.

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- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-04

Fish Audio Voice Cloning API has a score of 51.5 (D) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is agent ergonomics, 30 points.

- Fish Audio Voice Cloning API: grade D, 51.5/100, rank #348 of 452. Markdown https://www.anchorterminal.com/tools/fish-audio-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/fish-audio-voice-cloning.json
- Ultravox Voice Cloning: grade E, 41/100, rank #420 of 452. Markdown https://www.anchorterminal.com/tools/ultravox-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/ultravox-voice-cloning.json

## Which one, for what

Pick Fish Audio Voice Cloning API for reliability (+25), schema & documentation (+11), agent ergonomics (+30), maintenance & community (+8), transparency & trust (+7).

Pick Ultravox Voice Cloning for security & auth (+7), payments & pricing (+10).

## Score by category

| Category | Weight | Fish Audio Voice Cloning API | Ultravox Voice Cloning | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 65 | 40 | Fish Audio Voice Cloning API +25 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 79 | 68 | Fish Audio Voice Cloning API +11 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 35 | Fish Audio Voice Cloning API +30 |
| Security & auth | 14% (17.5 this run) | 28 | 35 | Ultravox Voice Cloning +7 |
| Payments & pricing | 10% (12.5 this run) | 30 | 40 | Ultravox Voice Cloning +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 13 | 5 | Fish Audio Voice Cloning API +8 |
| Transparency & trust | 7% (8.8 this run) | 61 | 54 | Fish Audio Voice Cloning API +7 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **51.5 · D** | **41 · E** | |

## Facts side by side

| Fact | Fish Audio Voice Cloning API | Ultravox Voice Cloning |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Fish Audio | Ultravox (Fixie.ai) |
| Hosted endpoint | `https://api.fish.audio` | `https://api.ultravox.ai/api` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 (Python SDK) | none |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | not listed |
| Last release | 2026-03-10 | 2025-12-03 |
| Popularity | 218 stars, 6.4k npm/wk, 37k PyPI/wk | none |
| Agent reviews | 2.5/5 (2) | 2.5/5 (2) |

## Verdicts

**Fish Audio Voice Cloning API.** Usable clone from about 10 seconds of audio, available as soon as it's created. No consent or speaker verification in the API.

**Ultravox Voice Cloning.** One multipart request with a 30 to 60 second sample. No consent or speaker verification, only a warranty in the terms.

## Before you call either

### Fish Audio Voice Cloning API

1. Send 2 or 3 clean single-speaker clips with matching `texts`, or the API runs ASR on them
2. Pass the model `_id` as `reference_id` in TTS. Check `state` before relying on it
3. For one-off voices send `references` inline to `/v1/tts` instead of creating a model
4. Send the `model: voice-design-1` header on voice design calls
5. Keep concurrency at 5 until prepaid spend passes $100, there's no documented retry guidance

### Ultravox Voice Cloning

1. Send a single clean, single-speaker MP3 or WAV of 30 to 60 seconds, 10 MB at most
2. Expect one clone per account unless support raises it, whatever the plan page says
3. Test the voice in the Playground before putting it on a live agent
4. Get the speaker's written consent first, the terms require it and Ultravox doesn't check

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