Langfuse, Inc.

Langfuse is Y Combinator-backed company (W23) founded in 2023 that builds open-source LLM engineering and observability tools. Backed by Lightspeed Venture Partners and La Famiglia, Langfuse helps developers and teams build, monitor, and improve production-grade LLM applications with its comprehensive suite of tools for tracing, prompt management, quality evaluation, and analytics.