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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 applications powered by large language models (LLMs — the technology behind tools like ChatGPT). It gives builders a central place to track how their AI is performing, test prompts (the instructions given to AI), evaluate quality, and debug problems in real time.

Why it matters

As more companies ship AI-powered products, understanding whether those products are actually working well becomes a critical business problem — and Langfuse is emerging as the open-source standard for solving it, with over 26,000 GitHub stars signaling strong developer adoption. The ability to self-host means companies with data privacy requirements aren't locked out, giving Langfuse a significant edge over closed, cloud-only competitors in regulated industries.

39Active

On the radar — signal detected

Stars
29.8k
Forks
3.1k
Contributors
176
Language
TypeScript

Score updated Apr 30, 2026

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