AI Voice / Review
Cartesia
Low-latency text-to-speech API (Sonic), subscription with credits.
$39
Cost / 1M chars
$5/mo
From
No
Free tier
Cartesia offers a low-latency text-to-speech API (Sonic) on a subscription-with-credits model. Paid plans start at $5 per month, and the effective cost works out to roughly $39 per million characters on the entry plan.
Developers building real-time voice agents where latency matters most.
Strengths
- +Ultra-low latency streaming
- +Instant cloning from ~10s audio
- +40+ languages on one model
- +Competitive per-character pricing
Trade-offs
- –Fewer prebuilt voices than rivals
- –App/UI thinner than ElevenLabs
- –Younger company, evolving docs
Cartesia at a glance
- Languages
- 40+
- Voice cloning
- Yes
- API
- Yes
- Commercial use
- Paid plans
- Styles/emotions
- Yes
- Output
- MP3, WAV, PCM