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
| Attribute | Cartesia | LMNT |
|---|---|---|
| Category | Voice | Voice |
| Pricing | FREEMIUM | FREEMIUM |
| License | Proprietary | Proprietary |
| Deployment | Cloud | Cloud |
| Platforms (differs) | API | Web, API |
| Model support (differs) | Single model (proprietary) | Self-contained (on-device) |
| Vendor (differs) | Cartesia | LMNT |
| Capabilities (differs) |
|
|
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
When to pick which
LMNT leans on Voice cloning as a headline capability; Cartesia treats it as secondary.
- Voice cloning (primary capability)
They also differ on:
- Platforms
- API · Web, API
- Model support
- Single model (proprietary) · Self-contained (on-device)
Their capability lists differ in recorded depth — compare the full lists above before deciding.