Langfuse

Langfuse is an open-source LLM engineering platform designed to help developers debug, evaluate, and improve their large language model (LLM) applications. It provides comprehensive observability features, including traces, evaluations, prompt management, and metrics, allowing users to inspect failures and build evaluation datasets. The platform integrates with popular LLM/agent libraries and is based on OpenTelemetry. Langfuse is ideal for developers and teams building and deploying LLM-powered applications, from hobby projects to large-scale enterprise solutions. It offers tools for prompt versioning, experimentation, and caching, along with robust evaluation capabilities including LLM-as-judge evaluators and human annotation. Key benefits include faster debugging, data-driven improvement of LLM performance, and streamlined prompt management, ultimately leading to more reliable and effective AI applications.