Langfuse
Open-source LLM observability and engineering platform for tracing, evaluating, and debugging AI applications. Langfuse provides production-grade monitoring with trace spans, cost tracking, prompt management, evaluation datasets, and a playground, all with no per-seat fees and a self-hostable MIT-licensed core.
The Collective Intelligence Report.
About Langfuse
Standout Features.
Deep Technical Alpha
LLM Tracing
Nested trace spans capture every LLM call, tool invocation, and retrieval step, with latency, token counts, and cost attribution across OpenAI, Anthropic, and other providers.
Evaluation & Datasets
Build evaluation datasets, run LLM-as-judge scoring, and track quality metrics over time to catch regressions before they reach users.
Prompt Management
Version-controlled prompt templates with A/B testing, rollback, and production deployment, manage prompts as code without redeploying your application.
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