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Langfuse

Langfuse is an open-source AI engineering platform for LLM observability, evaluation, prompt management and experimentation.

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Total funding $4M📍 Berlin · Western EuropeFounded 2022

About

Langfuse is an open-source AI engineering platform for LLM observability, evaluation, prompt management and experimentation. Founded in 2022 and backed by Y Combinator (W23), it is based in Berlin with an office in San Francisco; customers include Merck, Canva and Twilio. ClickHouse acquired Langfuse in January 2026, and the product remains MIT-licensed open source.

Capital graph

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LangfuseMarc KlingenMarc KlingenMax DeichmannMax DeichmannClemens RawertClemens Rawert
CompanyInvestorFounders / teamCo-investment (thicker arc = more shared deals, ×N marks the count)Bigger circle = stronger signal (activity / coverage / interest) · ⛶ fullscreen · scroll / pinch to zoom · hover to highlight · drag nodes · click a node to open its profile

Founders / core team

Marc Klingen联合创始人Max Deichmann联合创始人Clemens Rawert联合创始人

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Investors that may fit

Octopus Ventures

2 Optimization & Evals deals in the last 24 months · 1 in 西欧

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Plug and Play Ventures

2 Optimization & Evals deals in the last 24 months · 1 in 西欧

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Andreessen Horowitz

13 Optimization & Evals deals in the last 24 months

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Y Combinator

10 Optimization & Evals deals in the last 24 months

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Lightspeed

8 Optimization & Evals deals in the last 24 months

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Felicis Ventures

4 Optimization & Evals deals in the last 24 months

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Ranked by each firm’s deals in this sector over the last 24 months, weighted by nearby stage and shared geography. Indicative only — no rating judgment.

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