Cartesia vs LMNT
A side-by-side comparison of Cartesia and LMNT, 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
LMNT
Built for real-time agents — ~150–200ms streaming latency and voice cloning from a 5-second sample, priced below premium TTS rivals.
- Multilingual streaming synthesis
- Instant voice cloning from a sample
- Free tier plus affordable paid plans
- Integrates with major voice-agent stacks
- Commercial license on paid tiers
- Smaller voice library than ElevenLabs
- Quality trails top expressive TTS models
- Less brand recognition than incumbents