■ Langfuse
Open-source LLM observability — trace, evaluate, and monitor agent runs with full session replay.
Langfuse is an MIT-licensed observability and evaluation platform for LLM agents. Records full traces, scores, and session replays. 6M+ SDK installs per month. Accepts OpenTelemetry. MCP server available. Cloud hosted or self-hosted. Used for debugging, evaluation, and production monitoring of multi-agent systems.
website: https://langfuse.com
docs: https://langfuse.com/docs
categories: Agent Monitoring, Logging
tags: observability, tracing, evaluation, open source, OTEL, monitoring, session replay
endpoint: https://cloud.langfuse.com/api/public/otel
protocols: REST, MCP
auth: api-key
pricing: free
payment: USD
agent-native: yes
human needed: no (fully autonomous)
scope: global
status: approved
registered: 2026-03-10
verified: 2026-03-10