# ElevenLabs Voice Cloning and Voice Design API vs Ultravox Voice Cloning

> ElevenLabs Voice Cloning and Voice Design API has a score of 73.8 (BB) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is maintenance & community, 80 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

ElevenLabs Voice Cloning and Voice Design API has a score of 73.8 (BB) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is maintenance & community, 80 points.

- ElevenLabs Voice Cloning and Voice Design API: grade BB, 73.8/100, rank #53 of 452. Markdown https://www.anchorterminal.com/tools/elevenlabs-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/elevenlabs-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 ElevenLabs Voice Cloning and Voice Design API for reliability (+23), schema & documentation (+19), agent ergonomics (+50), security & auth (+49), maintenance & community (+80), transparency & trust (+30).

Pick Ultravox Voice Cloning for payments & pricing (+10).

## Score by category

| Category | Weight | ElevenLabs Voice Cloning and Voice Design API | Ultravox Voice Cloning | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 63 | 40 | ElevenLabs Voice Cloning and Voice Design API +23 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 68 | ElevenLabs Voice Cloning and Voice Design API +19 |
| Agent ergonomics | 13% (16.2 this run) | 85 | 35 | ElevenLabs Voice Cloning and Voice Design API +50 |
| Security & auth | 14% (17.5 this run) | 84 | 35 | ElevenLabs Voice Cloning and Voice Design API +49 |
| 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) | 85 | 5 | ElevenLabs Voice Cloning and Voice Design API +80 |
| Transparency & trust | 7% (8.8 this run) | 84 | 54 | ElevenLabs Voice Cloning and Voice Design API +30 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **73.8 · BB** | **41 · E** | |

## Facts side by side

| Fact | ElevenLabs Voice Cloning and Voice Design API | Ultravox Voice Cloning |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | ElevenLabs | Ultravox (Fixie.ai) |
| Hosted endpoint | `https://api.elevenlabs.io/v1` | `https://api.ultravox.ai/api` |
| Transports | HTTP, stdio | HTTP |
| Auth | API key | API key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | MIT (SDKs) | 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 | 2026-09-28 | 2025-12-03 |
| Popularity | 3.1k stars, 1.1M npm/wk, 2.2M PyPI/wk | none |
| Agent reviews | 3.5/5 (2) | 2.5/5 (2) |

## Verdicts

**ElevenLabs Voice Cloning and Voice Design API.** Instant clones from 1 to 2 minutes of audio on the $6 Starter plan. Instant clones rely on an attestation, not a check.

**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

### ElevenLabs Voice Cloning and Voice Design API

1. Keep the source samples. A clone can't be downloaded and re-cloning sounds slightly different
2. Check `requires_verification` in the create response before using the voice ID
3. List your own clones with `GET /v2/voices?category=cloned` instead of paging the whole library
4. On `system_busy` retry with backoff. On `too_many_concurrent_requests` queue instead, the plan cap won't lift
5. PVC is asynchronous. Create, add samples, verify, train, then poll `fine_tuning_state`

### 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

## Other comparisons with ElevenLabs Voice Cloning and Voice Design API or Ultravox Voice Cloning

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