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Categories · Text-to-Speech APIs

Amazon Polly vs Cartesia (Sonic)

Amazon Polly and Cartesia (Sonic) are both Text-to-Speech APIs, compared here on pricing, compliance, capabilities, and developer experience from structured, cited data - not reviews or paid placement. Amazon Polly starts lower at $4 1m characters vs $50 for Cartesia (Sonic). For coding-agent use, Cartesia (Sonic) scores higher on agent-friendliness (50 vs 30).

Comparedby a transparent data-readiness score computed from each API's published, sourced fields. No reviews, no paid placement. How we rank.

Data last verified 2026-06-21, with every field cited on each profile.

Head-to-head, from published, cited fields (auto-generated; no paid placement)
FieldAmazon PollyCartesia (Sonic)
Starting price$4 1M characters$50 1M characters
Pricing modelUsageHybrid
Free tier✓✓
Self-serve signup✓✓
SOC 2Type IIType II
HIPAA✓✓
GDPR✓✓
Webhooks✗✗
Sandbox✗✗
Documented actions2217

Full data and citations: Amazon Polly · Cartesia (Sonic). See more Text-to-Speech APIs.