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Langfuse vs TruLens: catalog facts
Langfuse	TruLens
Freemium Open source for self-hosting, with a hosted version that can be started for free.	Free Free and open source.
Web, Self-hosted	Windows, macOS, Linux
Tracing, prompt management and evaluation in one tool Can be self-hosted or used as a hosted service	OpenTelemetry-native tracing of every agent step Judges explain their scores, not just give numbers
Requires instrumenting your application with its SDK Self-hosting means running and maintaining the server yourself	Aimed at developers comfortable writing code LLM judges add their own model calls and cost
Self-hosted, Hosted service	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
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked October 1, 2026

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