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Company Facts

Langfuse is the open source LLM engineering platform, now part of ClickHouse. Teams use Langfuse to trace, evaluate, and improve LLM applications and AI agents in production. The platform provides:

• Observability & Tracing — Production tracing, metrics, and analytics for LLM applications
• Prompt Management — Version control and deployment of prompts with integrated monitoring
• Evaluations — LLM-as-a-Judge evaluations, datasets, and structured evaluation processes
• Collaboration — Shareable views, custom dashboards, and team collaboration features

Company

• Founded: 2023
• Acquired by ClickHouse: January 2026 (announcement)
• Headquarters: Berlin, Germany (Product & Engineering) and San Francisco, CA (GTM)
• Y Combinator: Winter 2023 batch (W23)
• Team Size: 17+ full-time employees
• Open Source License: MIT
• Public Company Handbook: langfuse.com/handbook

Funding History

• $4M Seed Round (November 2023) — Led by Lightspeed Venture Partners, General Catalyst (La Famiglia), and Y Combinator
• Acquired by ClickHouse (January 2026)

Most Important Links

• Acquisition Announcement: langfuse.com/blog/joining-clickhouse
• Video Demo
• Company Handbook: langfuse.com/handbook
• Changelog: langfuse.com/changelog
• Enterprise: langfuse.com/enterprise
• Documentation: langfuse.com/docs
• Roadmap: langfuse.com/docs/roadmap
• Blog: langfuse.com/blog

Why does Langfuse exist?

• Langfuse exists to accelerate the deployment of reliable, safe, explainable and cost-effective AI applications and agents.

• AI will create meaningful value for society and drive economic growth and we are still in the early days of seeing this impact. Over time, every successful company will be an AI company, with AI at the core of its strategy, value creation, and business processes. Most value creation will happen at the application-layer, split between incumbents and AI-native startups.

We're building an integrated and open tooling layer to help teams with:

• Visibility & explainability — Langfuse Observability (production tracing, metrics, and analytics)
• Collaboration across disciplines — Prompt management, shareable views & custom dashboards
• Evaluation & data operations — Langfuse Evaluations (evals, datasets, labeling)

Langfuse is vendor-neutral, based on OpenTelemetry, and available as cloud or self-hosted at production scale.

Why do customers choose Langfuse?

Customers choose Langfuse because it is:

• The most used open-source LLM Engineering platform (blog post)
• Model and framework agnostic with 80+ integrations
• Built for production and scale, backed by ClickHouse
• Designed for complex agents and multi-step workflows
• A complete toolbox for AI Engineering
• Incrementally adoptable — start with one feature and expand to the full platform over time
• API-first — all features are available via API for custom integrations
• Based on OpenTelemetry for interoperability
• Easy to self-host

Companies who trust Langfuse:

Key Milestones

A more detailed timeline is available in our handbook.

The Team

The Langfuse team is part of ClickHouse and continues to build the Langfuse platform from Berlin and San Francisco.

Media Assets

Logos

Official Langfuse logos, wordmarks, and downloadable brand packages are on the Brand Assets & Guide page.

2023: Founders during Y Combinator W23

2025: Team Offsite in Portugal

2026: Founder team

User Stories

Learn how leading companies use Langfuse to build production-grade AI applications.

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