Open-source alternatives to LangSmith

The open-source or self-hostable project you can use instead of LangSmith, with license, free-edition limits and setup checked against official sources.

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LangfuseAlternative to LangSmith
An open-source platform for tracing, evaluating and managing prompts for LLM applications.
MITSelf-hostedCloud
36k
GitHub stars
Some features paywalled

Langfuse — Langfuse is an open-source, self-hostable alternative to LangSmith for teams that want control of their LLM trace data.