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    Toollangfuse

    Langfuse — LLM Engineering

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

    llmobservabilitymonitoringevaluationprompt-managementopen-source+1
    Open Tool github.com
    28.2kStars
    2.9kForks
    TypeScriptLanguage
    NOASSERTIONLicense
    May 30, 2026Last push

    Langfuse is an open-source LLM engineering platform that provides observability, metrics, evaluation, prompt management, and a playground for AI applications. Integrates with OpenTelemetry, LangChain, OpenAI SDK, LiteLLM, and more. YC W23 graduate.

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