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DeepEvalTruLens
Free

The framework is free and open source.

 Free

Free and open source.

Command line Windows, macOS, Linux
  • Treats LLM output checks like unit tests
  • Very active development with a large user base
  • OpenTelemetry-native tracing of every agent step
  • Judges explain their scores, not just give numbers
  • Aimed at developers comfortable with Python code
  • Evaluations that rely on a judge model may need API access to one
  • Aimed at developers comfortable writing code
  • LLM judges add their own model calls and cost
Downloadable app Downloadable app
Open source Open source
License not stated License not stated
Not stated if an account is 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.