Berlin's Langfuse Joins ClickHouse
The Langfuse founders: Clemens Rawert (COO), Max Deichmann (CTO), Marc Klingen (CEO) - © Langfuse
ClickHouse has acquired Langfuse, a leading open-source platform for AI quality monitoring, according to a press release from ClickHouse. The announcement comes alongside the completion of a $400 million Series D funding round, signaling strong momentum for the analytical database company. The deal brings Berlin-based Langfuse and its entire team into the ClickHouse ecosystem, combining expertise in LLM observability with high-performance analytical capabilities.
Founded in 2023 and headquartered in Berlin, Langfuse has quickly established itself as a major player in the AI monitoring space. The platform has accumulated over 20,000 GitHub stars, 23.1 million SDK installs per month, and counts 19 Fortune 50 companies and 63 Fortune 500 firms among its users. Enterprise clients include Intuit, Twilio, 7-Eleven, and Merck.
The acquisition addresses a critical challenge in modern AI development: how to ensure AI applications are actually working as intended. Unlike traditional software, LLM-powered applications are non-deterministic, meaning the same prompt can produce different responses. This makes debugging and quality assurance fundamentally different.
"Generative AI will only earn enterprise trust when we can see what's happening under the hood," said Walid Mehanna, Chief Data & AI Officer at Merck, highlighting the importance of AI observability for enterprise applications.
The synergy between the two companies runs deep. Langfuse already runs entirely on ClickHouse infrastructure, both in its cloud offering and self-hosted deployments. This existing alignment promises tighter integration and improved performance going forward.
For users, nothing changes immediately. Langfuse remains completely open-source under its MIT license, allowing production-scale self-hosting. Langfuse Cloud continues operating as a standalone service with the same support levels. ClickHouse plans to release deeper integrations in the coming months, making LLM observability a native part of its agentic data stack.
The acquisition follows ClickHouse's strategy of partnering with category-leading open-source projects that share its commitment to developer experience and community-first development.
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