From €35 per user/month · Free plan🇳🇱
AI platform from Amsterdam with prompt versioning, A/B tests, evaluators and an AI gateway, with EU hosting by default.
Langfuse AI features, pricing and GDPR (October 2026)
Open-source platform from Berlin for prompt management, tracing and evals of LLM apps, as a cloud with an EU region or self-hosted.
Usage-basedFree plan
from $29 per month
Pricing details
Cloud: Hobby free (50K units per month), Core at $29, Pro at $199, Enterprise at $2,499 per month; additional units from $8 per 100K. Self-hosting free under the MIT license.
What is Langfuse?
Langfuse is an open-source platform for teams building LLM applications, combining prompt management with tracing, evaluations and analytics. It can be used as a managed cloud with US, EU or Japan regions or self-hosted for free.
Langfuse GmbH is registered in Berlin and is now part of ClickHouse. Prompt management stores prompts centrally with versions and labels, so non-technical team members can update them in the UI while applications fetch the current version; the SDK caches prompts client-side. Linking prompts to traces shows how each version performs. The cloud runs on AWS and ClickHouse Cloud in Oregon, Ireland and Tokyo, with a HIPAA region for Enterprise. Langfuse lists SOC 2 Type II and ISO 27001. As of September 28, 2026 the GitHub repository had about 35,100 stars.
Langfuse AI features and use cases
- Separates prompts from codePrompts are versioned in Langfuse and labeled, for example as production, and applications load them through the SDK. Product managers and domain experts can improve prompts without a code deployment.
- Tests prompts in a playgroundThe browser playground runs a prompt version against a model with test inputs. Teams try changes quickly before promoting them.
- Runs experiments on datasetsExperiments run prompt versions over stored datasets and record scores. Teams compare versions on the same cases instead of judging single examples.
- Connects prompts to production dataTraces show which prompt version produced each response, with cost and latency. Teams can find weak versions and see the effect of every change.
What sets Langfuse apart
- Open source under the MIT license and free to self-host with Docker or Kubernetes.
- Cloud regions in the US, EU (Ireland) and Japan, plus a HIPAA region for Enterprise.
- Usage-based cloud pricing with published graduated rates per 100K units.
Where Langfuse is strongest
Germany Available internationally
Langfuse GmbH is based in Berlin and is now part of ClickHouse.
Questions to ask before you buy Langfuse
Choose the EU region if traces contain personal data from EU users, and sign the data processing addendum, which ClickHouse now publishes and which names Langfuse Cloud. Subprocessors are listed on the ClickHouse subprocessor page. SSO requires the Teams add-on on Pro or Enterprise. When traces include employee prompts, check co-determination rules in Germany.
Using Langfuse in the EU: GDPR and AI Act
- Data locationMultiple regions, EU region available (according to the vendor). Hosting regions: United States, EU, Japan.
- Data processing agreementPublic, read it here (opens in a new tab). Subprocessor list (opens in a new tab).
- EU AI ActCheck whether the AI prepares decisions about people. If not, the high-risk rules usually do not apply. The high-risk obligations apply from December 2, 2027 (Digital Omnibus).
General information with sources, not legal advice.
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Questions about Langfuse
Can Langfuse be self-hosted for free?
Yes. Langfuse is open source under the MIT license and can be self-hosted with Docker or Kubernetes.
Where is cloud data stored?
In AWS regions in Oregon (US and HIPAA), Ireland (EU) and Tokyo (Japan), depending on the region you choose.
Does Langfuse offer SSO?
Yes, on the Pro plan with the Teams add-on and on the Enterprise plan.
Langfuse update historyno updates yet
No changes recorded for Langfuse yet.
Changes the vendor made and confirmed user reports, each checked against the vendor's own pages. We review every tool monthly.
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