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Langfuse

Infrastructure

Open-source LLM observability platform for tracing, evaluating and debugging language-model applications, plus a managed Langfuse Cloud service. Acquired by ClickHouse, announced 2026-01-16; continues under its own name and MIT licence.

Acquired by ClickHouse (2026)

Total funding—

Valuation—

Employees—

Founded2022

HeadquartersBerlin, Germany

StatusAcquired

Products

Selected offerings — the AI products recorded here, not the vendor's full catalogue.

• Langfuse Platform Sold on its own

  Open-source LLM observability platform for tracing, evaluating, prompt management and debugging language-model applications.

Inside Langfuse

• Langfuse Assistant Application Included with the parent

  In-product AI assistant for exploring Langfuse project data (traces, observations, metrics) and taking approved actions inside Langfuse.

Closest alternatives 3

AAArize AIPrivateArize's own page tells teams that have outgrown Langfuse to make Arize their first comparison for the same observability/eval job.1 of 1 capabilityShared product typeSourced competitorBuild and run AI agentsCompareHHeliconeAcquiredHelicone's own official comparison blog post against Langfuse.1 of 1 capabilityShared product typeSourced competitorBuild and run AI agentsCompareLLangChainPrivate · $160M raisedLangfuse's own FAQ/comparison page runs a direct head-to-head against LangSmith; both are LLM/agent observability platforms tagged build-ai-agents.1 of 1 capabilityShared product typeSourced competitorBuild and run AI agentsCompare

Similar products 18

How this list is ranked ↗

FAFiddler AIPrivate · $100M raisedLangfuse and Fiddler AI both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareBBraintrustPrivate · $125M raisedLangfuse and Braintrust both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareGGalileoAcquired ($68M deal)Langfuse and Galileo both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; both acquired, so no independent scale on either side.1 of 1 capabilityShared product typeCompareAAArthur AIPrivate · $62.7M raisedLangfuse and Arthur both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareCMComet MLPrivate · $70M raisedLangfuse and Opik both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareDDeepchecksAbsorbedLangfuse and Deepchecks LLM Evaluation both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale; Deepchecks is absorbed, with no independent scale.1 of 1 capabilityShared product typeCompareSSplunkAcquiredOverlaps on evaluation and observability; both acquired, so no independent scale on either side.1 of 1 capabilityShared product typeCompareW&Weights & BiasesAcquiredLangfuse and W&B Weave both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; both acquired, so no independent scale on either side.1 of 1 capabilityShared product typeCompareEElasticPublic · $10.2BLangfuse and Elastic LLM Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareHFHugging FacePrivate · $4.5BLangfuse Assistant and HuggingChat both serve buyers who need to use an everyday AI assistant; Langfuse is acquired, with no independent scale.Shared product typeCompareDDatadogPublic · $84.9BLangfuse and Agent Observability both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareDDatabricksPrivate · $190BLangfuse and Agent Bricks both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareHAHume AIPrivateLangfuse and Kairos Platform both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale; Hume AI's scale not recorded.1 of 1 capabilityShared product typeCompareBByteDancePrivateLangfuse and Coze Loop both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale; ByteDance's scale not recorded.1 of 1 capabilityShared product typeCompareCCognigyAcquiredLangfuse and Cognigy AI Ops Center both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; both acquired, so no independent scale on either side.1 of 1 capabilityShared product typeCompareDDecagonPrivate · $4.5BOverlaps on evaluation and observability; Langfuse is acquired, with no independent scale.1 of 1 capabilityShared product typeCompareMMercorPrivate · $20BLangfuse and Mercor Enterprise Evals both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale; ships data service rather than the same layer.1 of 1 capabilityDifferent layerCompareMMicrosoftPublic · $3.7TLangfuse and Observability in Foundry Control Plane both serve buyers who need to watch an AI agent for suspicious or runaway behaviour; Langfuse is acquired, with no independent scale.1 of 1 capabilityShared product typeCompare

Closest alternatives are pairs a vendor page itself compares. Similar products are matched from what each product does; nothing in that group is asserted as a rivalry.

Sources

Founded

Company disclosure · 31 Aug 2026

Langfuse's own Y Combinator company profile: "Founded:2022". This corrects an inference that would otherwise have been drawn from Langfuse's own About page naming Y Combinator's W23 (Winter 2023) batch as when the founders began working together -- the YC profile's explicit founding year is 2022, one year earlier, so the batch code was not a safe proxy for founding year and was not used.

Status

Press release · 16 Jan 2026

ClickHouse's own blog: "We are thrilled to announce that ClickHouse has acquired Langfuse." Langfuse continues under its own name, MIT-licensed, with Langfuse Cloud as a standalone service -- kept as its own record rather than merged, matching the Darktrace/W&B treatment. ClickHouse is added to this directory in the same batch, so this is a real parent/subsidiary pair.

Open Langfuse in the directory

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