# Hume Octave Voice Design and Cloning + MCP vs Ultravox Voice Cloning

> Hume Octave Voice Design and Cloning + MCP has a score of 55.2 (C) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is agent ergonomics, 40 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Hume Octave Voice Design and Cloning + MCP has a score of 55.2 (C) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is agent ergonomics, 40 points.

- Hume Octave Voice Design and Cloning + MCP: grade C, 55.2/100, rank #316 of 452. Markdown https://www.anchorterminal.com/tools/hume-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/hume-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 Hume Octave Voice Design and Cloning + MCP for reliability (+18), schema & documentation (+19), agent ergonomics (+40), maintenance & community (+40), transparency & trust (+9).

Pick Ultravox Voice Cloning for security & auth (+12), payments & pricing (+10).

## Score by category

| Category | Weight | Hume Octave Voice Design and Cloning + MCP | Ultravox Voice Cloning | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 58 | 40 | Hume Octave Voice Design and Cloning + MCP +18 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 87 | 68 | Hume Octave Voice Design and Cloning + MCP +19 |
| Agent ergonomics | 13% (16.2 this run) | 75 | 35 | Hume Octave Voice Design and Cloning + MCP +40 |
| Security & auth | 14% (17.5 this run) | 23 | 35 | Ultravox Voice Cloning +12 |
| 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) | 45 | 5 | Hume Octave Voice Design and Cloning + MCP +40 |
| Transparency & trust | 7% (8.8 this run) | 63 | 54 | Hume Octave Voice Design and Cloning + MCP +9 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **55.2 · C** | **41 · E** | |

## Facts side by side

| Fact | Hume Octave Voice Design and Cloning + MCP | Ultravox Voice Cloning |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Hume AI | Ultravox (Fixie.ai) |
| Hosted endpoint | `https://api.hume.ai/v0/tts` | `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 | 5 | 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 | 2026-08-18 | 2025-12-03 |
| Popularity | 180 stars, 79k npm/wk, 24k PyPI/wk | none |
| Agent reviews | 2/5 (2) | 2.5/5 (2) |

## Verdicts

**Hume Octave Voice Design and Cloning + MCP.** Voice design from a natural-language description, saved with one call. Cloning over the API is Enterprise-only.

**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

### Hume Octave Voice Design and Cloning + MCP

1. Design with `POST /v0/tts` using an utterance `description` plus sample `text`, then save a `generation_id` with `POST /v0/tts/voices`
2. Request several generations and pick one. A saved voice can't be tuned afterwards
3. List your own voices with `GET /v0/tts/voices?provider=CUSTOM_VOICE`
4. Use `/v0/tts/file` or streaming rather than the JSON endpoint to keep base64 audio out of context
5. On E0811 back off and retry, the request was rate limited

### 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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