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Opik vs Langfuse: catalog facts
Opik	Langfuse
Free The open-source platform is free to self-host.	Freemium Open source for self-hosting, with a hosted version that can be started for free.
Web, Self-hosted	Web, Self-hosted
Tracing, automated evaluations and dashboards together Covers RAG systems and agent workflows	Tracing, prompt management and evaluation in one tool Can be self-hosted or used as a hosted service
Self-hosting means running several services yourself Contributors must sign a CLA	Requires instrumenting your application with its SDK Self-hosting means running and maintaining the server yourself
Self-hosted	Self-hosted, Hosted service
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 September 26, 2026

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