Langfuse: Open Source LLM Engineering Platform

Langfuse is an open-source platform for building, monitoring, and improving AI applications that use large language models. It provides a complete set of tools including observability to track LLM calls and application logic, centralised prompt management with version control, flexible evaluation methods (including LLM-as-a-judge and user feedback), dataset management for testing and benchmarks, and an interactive playground for quick iteration. The platform integrates seamlessly with popular frameworks like LangChain, LlamaIndex, OpenAI SDK, LiteLLM, and many others. It can be used as a managed cloud service with a free tier or self-hosted on your own infrastructure via Docker, Kubernetes, or virtual machines. Langfuse is MIT-licensed, battle-tested, and widely adopted by the open-source community.

https://github.com/langfuse/langfuse

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