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TruLens vs Evidently: catalog facts
TruLens	Evidently
Free Free and open source.	Free Free and open source under the Apache 2.0 license.
Windows, macOS, Linux	Command line
OpenTelemetry-native tracing of every agent step Judges explain their scores, not just give numbers	Covers both LLM systems and classic ML models Checks for drift, hallucinations and data leaks
Aimed at developers comfortable writing code LLM judges add their own model calls and cost	Requires writing Python code to set up checks Some evaluations depend on access to a judge model
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: Apache-2.0
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
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 26, 2026

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