Langfuse

#5 in Observability & Evals

langfuse · siet 2023 (YC W23) · 6× · tolest 30. Juni 2026

64

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Langfuse is an open-source LLM engineering platform covering observability, tracing, prompt management, and evaluation for AI applications. Its core is MIT-licensed and can be self-hosted at no cost; a managed cloud offering is available with tiered subscription plans. The platform is framework-agnostic, natively supports OpenTelemetry, and is reportedly used in production by more than 2,300 companies.

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