Langfuse

LLM observability platform for tracing, evaluating, and monitoring AI applications.

ai agent framework
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Overview

Langfuse is an open-source LLM observability platform for inspecting AI applications and agents. It records traces for model calls, tools, retrieval, and agent steps, then associates them with sessions, costs, latency, and quality scores. Teams can use its SDKs or OpenTelemetry integrations to monitor production behavior and evaluate application changes.

Key features

End-to-end LLM and agent tracing
Tool and retrieval span tracking
Cost and latency analysis
Sessions and user context
Quality scores and evaluations
Python and JavaScript SDKs
OpenTelemetry integration

Use cases

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Last updated 2026-09-16