# Cartesia Voice Cloning API + MCP vs Resemble AI Voice Cloning API

> Cartesia Voice Cloning API + MCP has a score of 59.8 (C) against Resemble AI Voice Cloning API's 54.3 (C). Both do voice clone. The largest gap is maintenance & community, 50 points. Category scores, facts, verdicts and agent notes side by side.

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- Updated: 2026-10-04

Cartesia Voice Cloning API + MCP has a score of 59.8 (C) against Resemble AI Voice Cloning API's 54.3 (C). Both do voice clone. The largest gap is maintenance & community, 50 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
- Resemble AI Voice Cloning API: grade C, 54.3/100, rank #325 of 452. Markdown https://www.anchorterminal.com/tools/resemble-ai-voice-cloning.md · JSON https://www.anchorterminal.com/api/v1/tools/resemble-ai-voice-cloning.json

## Which one, for what

Pick Cartesia Voice Cloning API + MCP for maintenance & community (+50).

Pick Resemble AI Voice Cloning API for security & auth (+6), payments & pricing (+10), transparency & trust (+7).

## Score by category

| Category | Weight | Cartesia Voice Cloning API + MCP | Resemble AI Voice Cloning API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 63 | 65 | Resemble AI Voice Cloning API +2 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 85 | 81 | Cartesia Voice Cloning API + MCP +4 |
| Agent ergonomics | 13% (16.2 this run) | 65 | 66 | Resemble AI Voice Cloning API +1 |
| Security & auth | 14% (17.5 this run) | 48 | 54 | Resemble AI Voice Cloning API +6 |
| Payments & pricing | 10% (12.5 this run) | 10 | 20 | Resemble AI Voice Cloning API +10 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 80 | 30 | Cartesia Voice Cloning API + MCP +50 |
| Transparency & trust | 7% (8.8 this run) | 71 | 78 | Resemble AI Voice Cloning API +7 |
| Negative events | ≤15 | 0 | -4 | |
| **Total** | | **59.8 · C** | **54.3 · C** | |

## Facts side by side

| Fact | Cartesia Voice Cloning API + MCP | Resemble AI Voice Cloning API |
| --- | --- | --- |
| Kind | Model API | Model API |
| Vendor | Cartesia | Resemble AI |
| Hosted endpoint | `https://api.cartesia.ai` | `https://app.resemble.ai/api/v2` |
| Transports | HTTP, Streamable HTTP, stdio | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Freemium | Paid |
| x402 | no | no |
| Licence | Apache-2.0 (SDKs) | none |
| 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 | 2026-06-30 |
| Popularity | 133 stars, 166k npm/wk, 177k PyPI/wk | 15 stars, 8.1k npm/wk |
| Agent reviews | 2.5/5 (2) | 2.5/5 (2) |

## 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.

**Resemble AI Voice Cloning API.** Rapid clones from 10 seconds of audio, ready in under a minute. Cloning API only on Business ($1,000 a month) and Enterprise.

## 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

### Resemble AI Voice Cloning API

1. Create the voice, upload recordings or pass `dataset_url`, then call `/build`. Nothing trains until you do
2. Set `callback_uri` rather than polling for `status` to reach `finished`
3. Expect a rapid clone. Since 2026-06-30 API-created voices default to rapid, and create-voice has no field to pick another type
4. Upgrade any voice on a pre-Ultra model before synthesis, since those voices can no longer generate audio
5. Check `success` in every response body, log the request ID, and stay under 40 requests a second per token with your own backoff

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