Open source Self-hostable freemium
In these stacks
LicenseApache-2.0
PriceFree tier
UsageNo model cost
Model supportmulti
Languagespython, typescript
GitHub stars20.3k
Last activity2026-07-03
VerifiedThu Jun 25 2026 00:00:00 GMT+0000 (Coordinated Universal Time)
Verified byseed
An open-source platform from Comet for tracing, eval, and prompt testing that you can self-host.
Strengths
- Open source with self-host option
- Backed by Comet's MLOps experience
Tradeoffs
- Smaller community than Langfuse
- UI less polished than paid rivals
Covers
Self-hosting