Langfuse

Langfuse, previously known as Finto, operates out of Berlin, Germany, and focuses on providing solutions within the B2B engineering, product, and design sub-industry. The company, which has a team of three, participated in the Y-Combinator W23 batch and serves clients primarily in Germany and Europe. Langfuse offers an open source LLM engineering platform that includes features like observability, UI and prompt management, traces, analytics, metrics, evaluations, experiments, releases, and datasets, which are essential for LLM application development, monitoring, and testing. The platform has earned recognition by winning the #1 Golden Kitty Award in the AI Infrastructure Category. It supports integration with various SDKs including Python, JS/TS, OpenAI, as well as tools like Langchain, Llama-Index, Litellm, Flowise, and Langflow. Additionally, Langfuse provides comprehensive support resources including documentation, changelogs, interactive demos, pricing information, and API references, along with options for self-hosting.