Langfuse
Observability, evals, prompt management, and tracing for LLM apps. The default tool for teams shipping production AI.
- Location
- Berlin, Germany
- Raised
- $4M+
- Stage
- Seed
- Founded
- 2022
- Category
- Open Source
- Funding
- VC-backed
- Team
- 11-50
Funding figures as of Jul 2025 · not independently verified
Founders of Langfuse
- Marc Klingen
- Maximilian Deichmann
- Clemens Rawert
Investors backing Langfuse
- Lightspeed
- Y Combinator
Frequently asked questions
What does Langfuse do?
Observability, evals, prompt management, and tracing for LLM apps. The default tool for teams shipping production AI.
Where is Langfuse based?
Langfuse is based in Berlin, Germany.
When was Langfuse founded?
Langfuse was founded in 2022.
How much has Langfuse raised?
Langfuse has raised $4M+ in their Seed round as of Jul 2025.
Who founded Langfuse?
Langfuse was founded by Marc Klingen, Maximilian Deichmann, Clemens Rawert.
Who has invested in Langfuse?
Langfuse is backed by Lightspeed, Y Combinator.
How Langfuse would pitch themselves
○ Auto-generated01Target customer
Developers + open-source communities + enterprises wanting an OSS-first tool in this category, with optional commercial support.
02Problem they solve
Observability, evals, prompt management, and tracing for LLM apps. The default tool for teams shipping production AI. The category has historically been served by tools that miss the modern workflow this product is built around.
03Key differentiator
Langfuse differentiates on open-source llm engineering platform. Backed by Lightspeed + Y Combinator, $4M+ raised — the company has resources + validation to compound this thesis. Founded by Marc Klingen + team.
04Go-to-market strategy
Early-stage GTM — typically product-led growth (free tier or low-friction onboarding) paired with founder-led sales for the first 100 customers. Heavy content marketing + community presence on Twitter/X, LinkedIn, and category-specific Slack groups.