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langfuse/langfuse

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

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What it does

Langfuse is an open-source platform that helps teams build, monitor, and improve AI-powered applications by tracking how language models behave in production — think of it as a control center for debugging and measuring AI features. It connects with popular AI tools and can be run on your own servers, giving teams full visibility into what their AI is actually doing once it's live.

Why it matters

As AI features become standard in products, teams need a way to know if those features are actually working well — Langfuse fills that gap with monitoring, testing, and evaluation tools that reduce guesswork and speed up iteration. With 24,000+ stars and backing from Y Combinator, it's quickly becoming the go-to infrastructure layer for teams serious about shipping reliable AI products.

37Active

On the radar — signal detected

Stars
24.3k
Forks
2.5k
Contributors
142
Language
TypeScript

Score updated Apr 1, 2026

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