Cartesia vs Smallest.ai
A side-by-side comparison of Cartesia and Smallest.ai, two Voice tools, drawn from Ignaite's continuously-verified listings.
Compared from listings verified as of
At a glance
The honest brief
Cartesia
State-space Sonic models hit sub-100ms first audio — the latency floor for real-time voice agent loops.
- Streaming over WebSocket for fast first audio
- State-space architecture, not transformer
- Streaming-first WebSocket protocol depth
- Cost-competitive at scale
- Long-form expressive texture trails ElevenLabs
- Fewer voices than ElevenLabs catalog
- API-only, no end-user app
Smallest.ai
Bets on small, fast models — claims ~100ms to generate 10s of speech — to undercut the latency and cost of larger voice stacks.
- Very low TTS latency
- TTS + voice agents in one platform
- 30+ languages incl. Indian langs
- Cost-focused small models
- Younger, smaller company
- Enterprise/developer-oriented
- English + select langs strongest