Head to head · Agents · updated Oct 27, 2026
Deepgram vs Cartesia
Deepgram scores 17 to Cartesia's 9 on public evidence for voice & phone agents, and they rank #3 and #4 there. Both are free to start. Numbers below are the same public signals the ranking uses, recomputed nightly — nothing here is sponsored.
Deepgram
A speech-to-text and text-to-speech API built for low-latency streaming at scale.
+ Among the fastest real-time transcription APIs available, with diarization and keyword boosting built in.
− Developer-only; there is no end-user app, and accuracy on heavily accented speech trails Whisper-class models.
Cartesia
Sonic: very low-latency voice generation built for live conversation.
+ Latency low enough for a voice agent that can be interrupted.
− Fewer polished preset voices than ElevenLabs, and it is API-first.
Side by side
public evidence| Deepgram | Cartesia | |
|---|---|---|
| Evidence score / 100 | 17 | 9 |
| GitHub stars | closed source | closed source |
| Hacker News stories, 30d | 1 | 0 |
| Release-feed mentions, 30d | 0 | 0 |
| Last activity | – | – |
| Pricing | Free tier · $200 free credit; Nova STT from about $0.0043/min | Free tier · Free credits to try; usage-based after |
| Platforms | api | api, web |
| Maker | Deepgram | Cartesia |
Which one?
Pick Deepgram if
- you want the stronger public evidence (17 vs 9)
Best for real-time voice apps.
Pick Cartesia if
- you need it on web
Best for real-time voice agents.