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MLflowTruLens
Free

Free and open source.

 Free

Free and open source.

Web, Self-hosted, Command line Windows, macOS, Linux
  • Tracing built on OpenTelemetry, independent of LLM provider
  • 50+ built-in evaluation metrics and LLM judges
  • OpenTelemetry-native tracing of every agent step
  • Judges explain their scores, not just give numbers
  • Broad feature set takes time to learn
  • Running it for a team means hosting and maintaining a server yourself
  • Aimed at developers comfortable writing code
  • LLM judges add their own model calls and cost
Downloadable app, Self-hosted Downloadable app
Open source Open source
License: Apache-2.0 License not stated
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 26, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.