Open-source tracing, prompt management and evals you can host yourself. Built by Langfuse.
Others in observability
Common questions
Is Langfuse free to use?
Langfuse is open source and free to run yourself. You still pay whichever model provider you point it at, and this tutorial is free with no signup.
Do I need to know Python to use Langfuse?
Basic Python is enough. Functions, dictionaries and imports cover most of what Langfuse asks of you.
When should I not use Langfuse?
When something else in observability fits the job better. The others in that group are listed below.
Lessons for Langfuse are being written. Meanwhile the APIs for AI tutorial covers the same ground: state, tools, loops, memory and human approval. Most of it carries straight over.
Start the APIs for AI tutorial →