langfuselangfuse
🪢 Open source LLM engineering platform: LLM Observability, metrics, evals, prompt management, playground, datasets. Integrates with OpenTelemetry, Langchain, OpenAI SDK, LiteLLM, and more. 🍊YC W23
TL;DR · 30-second scan
langfuse (TypeScript) — 🪢 Open source LLM engineering platform: LLM Observability, metrics, evals, prompt management, playground, datasets. Integrates with OpenTelemetry, Langchain, OpenAI SDK, LiteLLM, and more. 🍊YC W23
You're running LLMs in production and need traces, evals, and prompt versioning in one place.
Analytics · AI & ML
Open-source LLM observability that actually scales. ~9k stars. Trace every prompt, score completions, run evals, manage prompts as code. Used by Khan Academy, Sumup, Twilio. The hosted tier is cheap; self-host on Postgres + ClickHouse if you have PII concerns. The competitor space (Helicone, Phoenix, LangSmith) is crowded — Langfuse wins on "framework-agnostic + production-ready".
You're running LLMs in production and need traces, evals, and prompt versioning in one place.
You're prototyping — console.log is enough until you ship.
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