Compare software

TruLens vs Opik: catalog facts
TruLens	Opik
Free Free and open source.	Free The open-source platform is free to self-host.
Windows, macOS, Linux	Web, Self-hosted
OpenTelemetry-native tracing of every agent step Judges explain their scores, not just give numbers	Tracing, automated evaluations and dashboards together Covers RAG systems and agent workflows
Aimed at developers comfortable writing code LLM judges add their own model calls and cost	Self-hosting means running several services yourself Contributors must sign a CLA
Downloadable app	Self-hosted
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
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.