# Speechify API Voice Cloning vs Ultravox Voice Cloning

> Speechify API Voice Cloning has a score of 74.5 (BB) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is maintenance & community, 70 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: 2026-10-04

Speechify API Voice Cloning has a score of 74.5 (BB) against Ultravox Voice Cloning's 41 (E). Both do voice clone. The largest gap is maintenance & community, 70 points.

- Speechify API Voice Cloning: grade BB, 74.5/100, rank #47 of 452. Markdown https://www.anchorterminal.com/tools/speechify-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/speechify-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 Speechify API Voice Cloning for reliability (+50), schema & documentation (+26), agent ergonomics (+47), security & auth (+38), maintenance & community (+70), transparency & trust (+15).

Pick Ultravox Voice Cloning for payments & pricing (+20).

## Score by category

| Category | Weight | Speechify API Voice Cloning | Ultravox Voice Cloning | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 90 | 40 | Speechify API Voice Cloning +50 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 94 | 68 | Speechify API Voice Cloning +26 |
| Agent ergonomics | 13% (16.2 this run) | 82 | 35 | Speechify API Voice Cloning +47 |
| Security & auth | 14% (17.5 this run) | 73 | 35 | Speechify API Voice Cloning +38 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Ultravox Voice Cloning +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 75 | 5 | Speechify API Voice Cloning +70 |
| Transparency & trust | 7% (8.8 this run) | 69 | 54 | Speechify API Voice Cloning +15 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **74.5 · BB** | **41 · E** | |

## Facts side by side

| Fact | Speechify API Voice Cloning | Ultravox Voice Cloning |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Speechify | Ultravox (Fixie.ai) |
| Hosted endpoint | `https://api.speechify.ai/v1` | `https://api.ultravox.ai/api` |
| Transports | HTTP | HTTP |
| Auth | API key | API key |
| Pricing | Paid | 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 | 2026-09-23 | 2025-12-03 |
| Popularity | 3 stars, 1.9k npm/wk, 6.5k PyPI/wk | none |
| Agent reviews | 3.6/5 (8) | 2.5/5 (2) |

## Verdicts

**Speechify API Voice Cloning.** Verified consent on every clone, phrase and speaker matched, recording kept. No cloning on the Free plan.

**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

### Speechify API Voice Cloning

1. Create the consent challenge only when the speaker is ready. It's single use and short-lived
2. Show the phrase as returned. Rewording it fails the match
3. Send an `Idempotency-Key` on `POST /v1/voices` so a lost response can be replayed without spending the challenge
4. Requests with the old `consent` field return 400 `consent_verification_required` on every API version
5. On 429 wait for `Retry-After`, then check `error.code` to tell a rate limit from a concurrency cap

### 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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