Why Langfuse?
Open Source
- Langfuse is open source.
- You can self-host it.
- Langfuse’s core tracing is MIT licensed and will always be freely available.
- We are transparent about what we are building and how.
- We iterate with our users and celebrate their feedback.
Developer First
- Langfuse is built for developers.
- We are creating a technical product with great developer experience.
- Langfuse is powerful yet simple, allowing you to build custom logic on top of it.
Reliable Partner
- All changes to the Langfuse API and integrations are covered by semantic versioning; we test public interfaces to ensure backward compatibility and run end-to-end integration tests for the most common use cases in CI.
- Raised a $4M seed round from Lightspeed Ventures, General Catalyst, Y Combinator, and angel investors.
- Strong adoption and community growth (see metrics).
- Learn more about us as a team.
Built for Complex Use Cases
- We designed Langfuse with complex, nested LLM calls in mind.
- Langfuse enables hierarchical representations of your application in traces. Why are traces the core abstraction for LLMOps? Learn more in this webinar.
- We go beyond Input/Output to include all the context of your app.
No Lock-In
- We are building Langfuse to be a core part of your stack.
- Langfuse has open APIs to integrate with your infrastructure.
- Langfuse is model and framework agnostic, aiming for interoperability of our integrations.
Comprehensive Feature Set
- We are building the core development tool you need to build robust LLM applications – more on this here.
- Tracing lies at our core. If a feature integrates well with traces, we will build it.
Security and Compliance
- We take security and compliance seriously.
- Privacy: You can choose to host in the EU or the US. We are GDPR compliant.
- Security: Langfuse Cloud is ISO 27001 and SOC 2 Type 2 certified.
- More details in our Security and Privacy Center.