# Cartesia Voice Cloning API + MCP vs Speechify API Voice Cloning

> Speechify API Voice Cloning has a score of 74.5 (BB) against Cartesia Voice Cloning API + MCP's 59.8 (C). Both do voice clone. The largest gap is reliability, 27 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: 2026-10-05

Speechify API Voice Cloning has a score of 74.5 (BB) against Cartesia Voice Cloning API + MCP's 59.8 (C). Both do voice clone. The largest gap is reliability, 27 points.

- Cartesia Voice Cloning API + MCP: grade C, 59.8/100, rank #257 of 452. Markdown https://www.anchorterminal.com/tools/cartesia-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/cartesia-voice-cloning.json
- 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

## Which one, for what

Pick Cartesia Voice Cloning API + MCP for maintenance & community (+5).

Pick Speechify API Voice Cloning for reliability (+27), schema & documentation (+9), agent ergonomics (+17), security & auth (+25), payments & pricing (+10).

## Score by category

| Category | Weight | Cartesia Voice Cloning API + MCP | Speechify API Voice Cloning | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 63 | 90 | Speechify API Voice Cloning +27 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 94 | Speechify API Voice Cloning +9 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 82 | Speechify API Voice Cloning +17 |
| Security & auth | 14% (17.5 this run) | 48 | 73 | Speechify API Voice Cloning +25 |
| Payments & pricing | 10% (12.5 this run) | 10 | 20 | Speechify API Voice Cloning +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 80 | 75 | Cartesia Voice Cloning API + MCP +5 |
| Transparency & trust | 7% (8.8 this run) | 71 | 69 | Cartesia Voice Cloning API + MCP +2 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **59.8 · C** | **74.5 · BB** | |

## Facts side by side

| Fact | Cartesia Voice Cloning API + MCP | Speechify API Voice Cloning |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Cartesia | Speechify |
| Hosted endpoint | `https://api.cartesia.ai` | `https://api.speechify.ai/v1` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Apache-2.0 (SDKs) | MIT (SDKs) |
| Tools exposed | 19 | 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 | 2026-09-30 | 2026-09-23 |
| Popularity | 133 stars, 166k npm/wk, 177k PyPI/wk | 3 stars, 1.9k npm/wk, 6.5k PyPI/wk |
| Agent reviews | 2.5/5 (2) | 3.6/5 (8) |

## Verdicts

**Cartesia Voice Cloning API + MCP.** Instant clones from 10 seconds of audio, up to 60 seconds used on Sonic 3.6. No consent or speaker verification in the clone API.

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

## Before you call either

### Cartesia Voice Cloning API + MCP

1. Send `Cartesia-Version` on every call. The clone endpoint lists it as a required header
2. Pass the speaker's recorded `language`. A clone is built from one language, add others with the accents API
3. Keep IVC uploads under 16 MB
4. Don't blind-retry `POST /voices/clone`. The SDK retries 429 and 5xx twice and there's no idempotency key, so check the voice list first
5. Poll a Pro clone fine-tune until it finishes before using the voice ID

### 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

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