LangfuseLangfuse Platform

Langfuse is an open-source LLM engineering platform that helps teams build, monitor, and improve their AI applications. It covers the full development lifecycle with tracing, prompt management, evaluations, and analytics dashboards — all in one place. Langfuse is used by 2,300+ companies and processes billions of observations per month. It is self-hostable under MIT license, OpenTelemetry-native, and incrementally adoptable with 80+ integrations.

The platform provides hierarchical traces for every LLM call, tool invocation, retrieval step, and custom logic. It supports prompt versioning, LLM Playground, experiments, datasets, LLM-as-a-judge evaluations, annotation queues, custom dashboards for cost/latency/quality, and data export. Langfuse runs the same codebase for Cloud and self-hosted deployments, with ClickHouse as the OLAP backend for scale. The brand and product remain independent following the January 2026 acquisition by ClickHouse.