Langfuse
Open-source tool for tracing and evaluating AI apps. Acquired by ClickHouse in January 2026.
- Revenue
- Bought by ClickHouse (Jan 2026)
- Value
- Acquisition price not disclosed (Jan 2026)
- Listed
- Private
Open-source and free to self-host, so teams can keep their trace data in-house.
Its future now depends on the roadmap of its new parent, ClickHouse.
Money going out
Who Langfuse pays to do what it does.
No suppliers of Langfuse mapped yet.
Where it sits on the map
Competitors and neighbours
Makes switches, routers and AI networking systems sold to cloud providers and enterprises.
About $4B of AI infrastructure revenue in fiscal 2026 (year to July 2026)
Open profileRuns a fast open-source database used for analytics. Bought Langfuse to add AI tracing to its stack.
Completed a $400M Series D alongside the Langfuse deal (Jan 2026). Valuation not in the source
Open profileTests AI models for hallucinations, errors and safety problems, and monitors them once they are live.
Total funding about $68M. Its $45M Series B was led by Scale Venture Partners (dated Oct 2024 by CB Insights)
Open profileMakes LangChain, a popular framework for building AI apps, and LangSmith, its tracing and testing product.
LangSmith annual recurring revenue reported at $12M to $16M (TechCrunch, 2025). Not confirmed by the company
Open profileMonitors AI models and agents in production, finding drift, errors and bad answers.
$70M Series C (2025)
Open profileTests and scores AI outputs, and traces each step of an AI app so teams can find and fix failures.
$80M at about $800M valuation (Feb 2026)
Open profileEvaluates LLMs and AI agents for accuracy and safety, and builds simulated worlds to test agents.
Company says revenue grew more than 15 times in the past year. Not audited
Open profileSources: clickhouse.com, orrick.com
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