Langfuse

Langfuse is an open-source LLM engineering platform designed to streamline the development, monitoring, and testing of Large Language Model applications. It provides comprehensive tools for tracing, evaluating, and managing prompts, along with key metrics to facilitate debugging and continuous improvement. The platform offers a user-friendly interface and robust prompt management capabilities for efficient development. Langfuse enables thorough monitoring through traces, analytics, metrics, and evaluations, ensuring optimal performance. Furthermore, it supports rigorous testing with experiments, releases, and datasets, empowering users to refine and enhance their LLM applications throughout the entire lifecycle. Langfuse was acquired by Clickhouse in January 2026.