Langfuse

Open source · MITFree to self-host; paid cloud plans optional

Langfuse

by Langfuse

Open-source tracing, evals and metrics for LLM apps and agents.

35.4k stars on GitHub, Oct 2026

Why it's useful

Shows you every call your agent made, what it cost and where it went wrong, so you can fix it instead of guessing. Self-host it for free.

What it needs

Docker to self-host. A few enterprise folders aren't MIT

The details

Price
Free to self-host; paid cloud plans optional
Licence
Open source (MIT)
Runs on
Command line, Linux, Cloud
Made by
Langfuse
Category
Agents & MCPCoding

Image: Langfuse. Langfuse belongs to Langfuse; we just think it's worth knowing about.

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