# Amazon Polly vs Cartesia Sonic TTS API + MCP (slim)

> Amazon Polly has a score of 75.8 (BB) against Cartesia Sonic TTS API + MCP's 64.2 (B). Both do speech tts. The largest gap is reliability, 37 points. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/amazon-polly-vs-cartesia-tts.md (~1,700 tokens) · this version ~380 tokens · JSON https://www.anchorterminal.com/compare/amazon-polly-vs-cartesia-tts.json · canonical https://www.anchorterminal.com/compare/amazon-polly-vs-cartesia-tts
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Amazon Polly has a score of 75.8 (BB) against Cartesia Sonic TTS API + MCP's 64.2 (B). Both do speech tts. The largest gap is reliability, 37 points.

- Amazon Polly: BB 75.8, rank #29 of 452 · https://www.anchorterminal.com/tools/amazon-polly.min.md
- Cartesia Sonic TTS API + MCP: B 64.2, rank #187 of 452 · https://www.anchorterminal.com/tools/cartesia-tts.min.md
- Pick Amazon Polly for reliability (+37), agent ergonomics (+17), security & auth (+22), transparency & trust (+9). Pick Cartesia Sonic TTS API + MCP for payments & pricing (+10), maintenance & community (+29).

| Category | Amazon Polly | Cartesia Sonic TTS API + MCP |
| --- | --- | --- |
| Reliability (16%) | 100 | 63 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 90 | 86 |
| Agent ergonomics (13%) | 82 | 65 |
| Security & auth (14%) | 80 | 58 |
| Payments & pricing (10%) | 20 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 50 | 79 |
| Transparency & trust (7%) | 80 | 71 |