Observability
Langfuse
Trace AI calls, inspect agent runs, manage prompts, and evaluate outputs.
36.1K GitHub starsAs of Checked
Where it fits
What you can use it for
Teams that need a shared view of AI behavior and cost.
Trace agent runs, evaluate outputs and understand costs.
Before you adopt
What to check for your team
Self-hosting and cloud options differ. Set retention and access controls for prompts, outputs, and traces.
Get help evaluating the fitLicence and scope
MIT core
MIT applies outside ee/, web/src/ee/ and worker/src/ee/. Enterprise code has a separate commercial license; dependencies retain their own terms.
Read the upstream licenceSupport the work
Go directly to the maintainers
Use the project's contribution guidance to report issues, help with documentation or contribute code. Follow any published funding links if you want to support the maintainers financially.
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