Langfuse
Open-source LLM engineering platform: observability, prompt management, evaluations, and datasets for AI applications.
About Langfuse
Langfuse is an open-source LLM engineering platform that helps teams collaboratively develop, monitor, evaluate, and debug AI applications. It provides tracing with full OpenTelemetry support, prompt management with version control, LLM evaluations (LLM-as-judge, code evaluators, manual labeling), datasets for test suites and benchmarks, and an LLM playground for prompt iteration.
Langfuse integrates with LangChain, OpenAI SDK, LlamaIndex, LiteLLM, Haystack, Vercel AI SDK, LangFlow, Flowise, OpenWebUI, Dify, and dozens of other frameworks and tools. Deploy via Docker Compose on a single VM or Kubernetes via Helm for production.
Langfuse is MIT licensed (with EE features) and backed by ClickHouse. It is used by LangFlow (116k stars), Open WebUI (148k stars), and thousands of AI development teams worldwide.
Key Features
- LLM tracing with full OpenTelemetry support for debugging AI applications
- Prompt management with version control and collaborative iteration
- Evaluation suite: LLM-as-judge, code evaluators, manual labeling, and datasets
- Integrates with LangChain, OpenAI, LlamaIndex, LiteLLM, and 30+ frameworks
Self-Hosting Notes
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