Langfuse
An open-source LLM engineering platform for tracing, evaluation, prompt management and debugging.
Sources and review
Checked against public documentation on . Suitability guidance is our editorial judgment; this is not a performance benchmark or an endorsement.
Teams that want production-grade, self-hostable tracing and evals for LLM apps.
About Langfuse
Langfuse helps teams develop, monitor, evaluate and debug AI applications: it ingests traces of LLM calls, retrieval, embeddings and agent actions, runs evaluations, manages prompts and datasets, and integrates with the major LLM SDKs and frameworks. It can be self-hosted or used as Langfuse Cloud, and has been part of ClickHouse since January 2026. Most of the code is MIT-licensed; enterprise directories carry a separate licence.
Langfuse is an open-source project written primarily in TypeScript, with 35k stars on GitHub. It was last updated in September 2026.
pip install langfuse
