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Langfuse

Open Source Agent Evals & Observability

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Domain Rating by Ahrefs, checked 3 Oct 2026, changed 3 Oct 2026.

What it is

Open source platform to trace, evaluate, and improve AI agents. Use production data to understand behavior, collaborate on fixes, and ship better quality at lower cost and latency.

Quick answers

What is Langfuse?
Langfuse is an open-source AI engineering platform that helps teams build, monitor, and improve their LLM applications. It covers the full development lifecycle with tracing, prompt management, evaluations, and analytics dashboards — all in one place. It is used by 50,000+ companies and processes billions of observations per month.
Can I use just tracing without the other features?
Yes, you can use just tracing without the other features. All components of Langfuse work great standalone but excel when used together.
Can I self-host Langfuse for free?
Yes, Langfuse is MIT licensed and all product features are available under the MIT license. You can self-host at scale using Docker Compose, Kubernetes (Helm), or Terraform (AWS, GCP, Azure).

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Key features

  1. Hierarchical traces capture every LLM call, tool invocation, and retrieval step
  2. LLM-as-a-judge, heuristic functions, or human review evaluations
  3. Prompt management with one-click deployments and rollbacks
  4. Playground to test prompts on real production inputs and compare models
  5. Experiments with test cases and side-by-side comparison
  6. Human annotation and collaborative human-in-the-loop workflows
  7. Cost and latency monitoring with dashboards and alerts
  8. REST APIs and Query SDK for data access
  9. Langfuse Assistant to automate the AI engineering loop

More on this profile

Langfuse has a free listing. The owner can unlock the full profile for $5:

Link metrics

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Top topic: Business/Marketing and Advertising (35). Checked 3 Oct 2026, changed 3 Oct 2026. Link data by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

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