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Langfuse

Langfuse

Open-source observability, evaluation, and prompt management for AI applications

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What this product helps you do

Langfuse brings observability, prompt management, evaluation, datasets, and metrics into one open-source AI engineering platform. Teams can inspect LLM and non-LLM steps, visualize agent graphs, test prompt versions, collect scores, and connect production traces to repeatable experiments.

Problems it solves

  • Non-deterministic AI application behavior is difficult to debug
  • Teams cannot easily compare prompt versions and model changes
  • Quality, latency, token, and cost signals are scattered
  • Production failures are difficult to turn into repeatable evaluations
Best for
AI engineersLLM application teamsPrompt and evaluation teamsOpen-source platform teams

Langfuse is an open-source AI engineering platform for observing and improving LLM and agent applications. Traces capture model calls and surrounding steps such as retrieval, embeddings, and API calls, while sessions, users, agent graphs, and dashboards help teams investigate behavior over time.

Prompt Management centralizes prompt versions and deployment labels, with client-side caching for application retrieval. Evaluation tools, datasets, experiments, and scores support systematic quality work. Langfuse is available as a hosted cloud service with a free tier and paid usage plans, or as a self-hosted project.

Information

DeveloperLangfuse GmbH
Languagesen
Pricing modelfreemium
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