TruLens
Evaluation and tracking for LLM experiments and AI agents.
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About TruLens
TruLens is listed in our evals & observability category and is aimed at builders. Evaluation and tracking for LLM experiments and AI agents. Pricing, as the maker states it: Open source. Maturity: Active. We last checked the official link on 2026-10-16.
What is TruLens?
TruLens finds where your agent fails and where you can cut cost without losing quality. It is open source and OpenTelemetry-native.
You instrument an app with a decorator, score each step with LLM judges that explain themselves, and compare versions.
Sources: the official README and our directory listing, checked 2026-10-18. Official site: trulens.org.
Who is TruLens for?
Developers evaluating and improving agents.
TruLens at a glance
- Open source: Yes (MIT License)
- GitHub: truera/trulens · 3,605 stars (as of Oct 21, 2026)
Key features
- OpenTelemetry-native
- LLM-judge scoring
- Version comparison
TruLens FAQ
What is TruLens?
TruLens finds where your agent fails and where you can cut cost without losing quality. It is open source and OpenTelemetry-native.
Who is TruLens for?
Developers evaluating and improving agents.
Is TruLens free?
TruLens's pricing, as the maker states it: Open source. Open-source tools are free to use, though you may still pay for model API usage or a hosted plan. Check the official site for current plans.
Is TruLens open source?
Yes. TruLens is released under the MIT License, according to its GitHub repository.
What are alternatives to TruLens?
Similar tools include Respan, Arize AI, AgentOps, AI Beat, Agenta and OpenLIT.
TruLens ratings and reviews
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