Langfuse

Langfuse is an online service that provides open-source observability and analytics for LLM apps. With detailed production traces and a granular view on quality, cost, and latency, Langfuse helps users debug faster. It offers free and paid plans and can be accessed through the website or API. Account registration is required to use the service. With around 20,000 monthly visits, Langfuse is a valuable tool for tracing and debugging complex LLM applications.