Langfuse (YC W23)

Langfuse is an open-source LLM Engineering platform that allows teams to collaboratively develop, monitor, evaluate, and debug AI applications. With the ability to self-host within minutes, Langfuse has been battle-tested and is used in production by thousands of users, including YC startups and large companies like Khan Academy and Twilio. Developers can trace any Large Language model or framework using Langfuse's SDKs for Python and JS/TS, open API, or native integrations, such as OpenAI and Vercel AI SDK. Product managers can analyze, evaluate, and debug AI products using the Langfuse Dashboard, accessing detailed metrics on costs, latencies, and user feedback. The last investment was a significant $4.00M Seed Round investment on November 7, 2023, with Lightspeed Venture Partners, Y Combinator, and La Famiglia as the investors. Langfuse is operating in the industries of AI, Developer Tools, and SaaS, with its headquarters in the United States.