Langfuse is an open-source observability and analytics platform designed specifically for Large Language Model (LLM) applications. It helps developers monitor, debug, and optimize their AI applications by providing detailed tracing of LLM interactions, tracking metrics like latency and token usage, and enabling evaluation of model performance across different prompts and configurations. The platform integrates with popular LLM frameworks and providers, offering both a self-hosted option and a managed cloud service, making it easier for teams to understand how their AI systems behave in production and improve them over time.