Langfuse

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Langfuse is an open-source LLM engineering platform designed to help teams build production-grade LLM applications faster. The platform provides tools for tracing, evaluating, managing prompts, and tracking metrics to debug and improve LLM applications. Langfuse supports detailed production traces, collaborative prompt versioning and deployment, playground testing for prompts and models, user feedback collection, dataset derivation for fine-tuning, and comprehensive metrics tracking for cost, latency, and quality. It integrates with various LLM applications and models through SDKs for Python and JS/TS, native integrations for popular libraries, and OpenTelemetry support. Langfuse is committed to open source, allowing users to run it locally or self-hosted. The platform is SOC 2 Type II and ISO 27001 certified, GDPR compliant, and aligned with HIPAA, making it suitable for enterprise use. Langfuse is backed by notable investors and serves teams building complex LLM applications.