Langfuse, Inc.
Langfuse is an open-source platform for LLM engineering that provides observability, metrics, evaluations, and prompt management to help teams build production-grade AI applications.
At a Glance
- AI Engineering Teams
- Startups building LLM apps
- Enterprises integrating AI
AI Tools by Langfuse, Inc.
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Langfuse
Open Source LLM Observability Platform
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Latest News
ClickHouse acquires AI observability startup Langfuse
ClickHouse raises $400M Series D, acquires Langfuse
Langfuse releases Fast Preview (v4) with performance improvements
Langfuse raises $4M Seed Round led by Lightspeed
Products & Services
Core platform for capturing full context of LLM applications, including hierarchical tracing, performance analytics, and session tracking.
Tools for versioning, managing, and caching prompts with seamless integration into application code.
Features for LLM-as-a-judge evaluators, human annotation queues, and dataset management for testing and benchmarking.
Market Position
Leading open-source alternative to LangSmith and Arize Phoenix, focusing on developer experience, model-agnosticism, and self-hosting capabilities.
Leadership
Founders
Marc Klingen
CEO and Co-founder. Previously worked in Revenue Operations at Alasco, Investment Analyst at Cherry Ventures, and Sales Strategy at Google Cloud. He also served as a Product Manager at DHL and Afilio.
Maximilian Deichmann
Co-founder. Previously a Software Engineer at Trade Republic, iOS Engineer at mydays GmbH, and Investment Manager at SevenVentures. He has a strong background in both software engineering and business development.
Clemens Rawert
President and Co-founder. Previously a Lead Engineer at Klarna. He has extensive experience in scaling high-performance engineering systems.
Executive Team
Marc Klingen
CEO and Co-founder (now Director of AI Engineering Platform at ClickHouse)
Focuses on product strategy and leadership. Background in investment and operations at Google and Cherry Ventures.
Clemens Rawert
President and Co-founder
Leads engineering and operations. Previously Lead Engineer at Klarna.
Board of Directors
Founding Story
Founded in 2022 by Clemens, Max, and Marc. They initially built a usage-based billing product called Finto while in the YC W23 batch. Recognizing a larger need for LLM tooling, they pivoted to building Langfuse, an open-source analytics platform for LLM apps.
Business Model
Revenue Model
Open Core / SaaS. Offers a free self-hostable version and a managed Langfuse Cloud with usage-based and subscription tiers.
Pricing Tiers
50k units/month, 30-day data access, 2 users.
100k units/month included, 90-day data access, unlimited users.
100k units/month included, 3-year data access, SOC2/ISO27001, HIPAA available.
Custom volume pricing, audit logs, SCIM API, SLA, and dedicated support.
Target Markets
- AI Engineering Teams
- Startups building LLM apps
- Enterprises integrating AI
- Debugging LLM applications
- Monitoring production quality
- Prompt engineering workflows
- Analyzing token costs and latency
- Intuit
- Twilio
- Khan Academy