Langfuse
Open-source LLM observability you can self-host
AI Agents / Memory & Evals · OSS/MIT · 34.1k
What's Good
Langfuse is the open-source default for LLM observability. The entire stack—web app, worker, Postgres, ClickHouse, Redis—runs on your infrastructure under MIT license. OpenTelemetry-style tracing captures the full tree of spans and generations with token counts, latency, cost, and model metadata.
The Catch
Self-hosting means self-operating—you are running Postgres, ClickHouse, Redis, and the app. Observability-first means evals are layered on, not central.
Verdict
The LLM observability platform for teams who want to own their data.
Embed
[](https://stackgems.com/gems/langfuse)