# Langfuse

> Langfuse is an open-core LLM observability and evaluation platform whose repository is MIT-licensed except for the ee/ directory; ClickHouse acquired it in January 2026 and committed to keeping the MIT product open, with Cloud and self-hosted running the same codebase on ClickHouse.

Open-source LLM observability and evaluation, acquired by ClickHouse in 2026.

- **Category:** Observability
- **License:** MIT (core; ee/ is commercial)
- **Language:** TypeScript
- **Self-hosted:** Yes
- **GitHub stars:** 35358 (2026-10-04)
- **Repository:** https://github.com/langfuse/langfuse
- **Last verified:** 2026-10-04

> Caveat: Enterprise features (RBAC, audit logs) live in the separately licensed ee/ directory.

Source: https://agent.c8.fit/tools/langfuse/