Open-source LLM engineering platform for tracing, evals, and prompts.
Category: Observability & Infra · Type: Open-source LLM observability · Website: https://langfuse.com
Overview
Langfuse is an open-source (MIT), self-hostable platform for tracing LLM/agent calls, running evaluations, managing prompts, and tracking cost and quality in production. It is framework-agnostic and popular with teams wanting to own their data. Langfuse was acquired by ClickHouse in January 2026 and continues to operate under its own name.
Key Features
- Open-source, self-hostable tracing
- Evals, scoring, and datasets
- Prompt management and versioning
- Cost and latency analytics
Role in the Agentic AI Stack
An open alternative to LangSmith for monitoring and improving agents.
Part of Agentic AI Landscape → Observability & Infra