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langfuse
TypeScript

langfuse

🪢 Open source AI engineering platform: LLM evals, observability, metrics, prompt management, playground, datasets. Integrates with OpenTelemetry, LangChain, OpenAI SDK, LiteLLM, and more. 🍊YC W23

by langfuse · GitHub
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analyticsautogenevaluationTypeScriptSelf-hostable
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In plain words

Langfuse traces every LLM call, tool use and cost in your application, with prompt management and evaluation built in — self-hostable.

From the README

Install
pip install langfuse openai

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34k30k
2026-06-272026-08-31
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📄 About

🪢 Open source AI engineering platform: LLM evals, observability, metrics, prompt management, playground, datasets. Integrates with OpenTelemetry, LangChain, OpenAI SDK, LiteLLM, and more. 🍊YC W23

langfuse has 33.9k stars on GitHub. It has been forked 3.7k times. langfuse is written mainly in TypeScript. It has been in active development since 2023. Its main topics are analytics, autogen, evaluation, langchain.

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Frequently asked questions

What is langfuse?

🪢 Open source AI engineering platform: LLM evals, observability, metrics, prompt management, playground, datasets. Integrates with OpenTelemetry, LangChain, OpenAI SDK, LiteLLM, and more. 🍊YC W23

Is langfuse open source?

langfuse is an open-source project.

Is langfuse free?

Yes. langfuse is free and open source — you can use, modify and self-host it.

What language is langfuse written in?

langfuse is written mainly in TypeScript.

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