About
Langfuse is an open-source LLM engineering platform that provides observability, prompt management, evaluation, and experimentation tools for AI applications. It helps teams trace every LLM call, monitor cost and latency, run evaluations, and continuously improve their AI products from prototype to production. It integrates with 100+ frameworks and model providers with no vendor lock-in.
Why it made the leaderboard
If you're shipping AI apps to production and need to understand why your LLM is behaving unexpectedly, Langfuse gives you full traces, prompt versioning, and automated evaluations without locking you into a SaaS vendor — you can self-host the entire stack via Docker in minutes. The depth of integrations (LangChain, OpenAI SDK, LiteLLM, OpenTelemetry) means it plugs into whatever stack you're already using rather than forcing a rewrite.
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