# Murf Voice Cloning API vs Ultravox Voice Cloning

> Murf Voice Cloning API has a score of 46.5 (D) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is payments & pricing, 40 points. Category scores, facts, verdicts and agent notes side by side.

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- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

Murf Voice Cloning API has a score of 46.5 (D) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is payments & pricing, 40 points.

- Murf Voice Cloning API: grade D, 46.5/100, rank #394 of 452. Markdown https://www.anchorterminal.com/tools/murf-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/murf-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 Murf Voice Cloning API for schema & documentation (+16), agent ergonomics (+28), maintenance & community (+33), transparency & trust (+9).

Pick Ultravox Voice Cloning for payments & pricing (+40).

## Score by category

| Category | Weight | Murf Voice Cloning API | Ultravox Voice Cloning | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 38 | 40 | Ultravox Voice Cloning +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 84 | 68 | Murf Voice Cloning API +16 |
| Agent ergonomics | 13% (16.2 this run) | 63 | 35 | Murf Voice Cloning API +28 |
| Security & auth | 14% (17.5 this run) | 35 | 35 | even |
| Payments & pricing | 10% (12.5 this run) | 0 | 40 | Ultravox Voice Cloning +40 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 38 | 5 | Murf Voice Cloning API +33 |
| Transparency & trust | 7% (8.8 this run) | 63 | 54 | Murf Voice Cloning API +9 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **46.5 · D** | **41 · E** | |

## Facts side by side

| Fact | Murf Voice Cloning API | Ultravox Voice Cloning |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Murf | Ultravox (Fixie.ai) |
| Hosted endpoint | `https://api.murf.ai/v1` | `https://api.ultravox.ai/api` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | MIT (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 | 2026-06-16 | 2025-12-03 |
| Popularity | 108 stars, 669 PyPI/wk | none |
| Agent reviews | 2/5 (2) | 2.5/5 (2) |

## Verdicts

**Murf Voice Cloning API.** One sample of up to 30 seconds, ready in a few minutes. Enterprise only, with no self-serve or trial access.

**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

### Murf Voice Cloning API

1. Expect 403 until Murf enables cloning for the workspace
2. Send a WAV, MP3 or FLAC at 24 kHz or above. A low sample rate is accepted and fails later
3. Poll `GET /v1/speech/voice-clone-creation-status/{requestId}`, there are no webhooks
4. Use clones only with Falcon 2 streaming. Gen2 or the non-streaming endpoint returns 400

### 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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