Langfuse

What is Langfuse?

Open-source tracing, prompt management and evals for LLM apps.

Who is Langfuse best for?

Langfuse is best for engineering teams building LLM apps who want tracing, prompt versions and evals in one tool.

• Debugging agents in production

  Nested traces record every model call, tool call and retrieval step, and you can filter them by user, session, cost or latency.

• Teams that version prompts

  Prompts live outside the code with versions, release labels and one-click rollbacks.

• Testing changes before shipping

  Datasets, experiments and LLM-as-a-judge or human scoring show whether a new prompt or model does better.

• Teams that keep data in-house

  The core platform is open source under the MIT license and self-hosts on Docker, Kubernetes or Terraform at no cost.

How much does Langfuse cost?

Langfuse is free on the Hobby cloud plan or when you self-host the open-source version, and its paid cloud plans cost $29 a month for Core, $199 for Pro or $2,499 for Enterprise.

Extra units get cheaper with volume: $8 per 100,000 up to 1M, $7 up to 10M, $6.50 up to 50M and $6 beyond. A unit is any trace, observation or score you send. The Teams add-on for Pro costs $300 a month and adds enterprise SSO, fine-grained access control and a shared Slack or Teams channel. Self-hosting the open-source version (MIT license) is free with all core features; a self-hosted Enterprise edition is priced on request and bundled with a ClickHouse plan. Startups get 50% off the first year, research and students up to 100% off, non-profits $199 in credits a month and open-source projects $300 in credits a month for the first year. Full pricing on langfuse.com. We checked these prices on 27 Sep 2026.

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Is Langfuse open source?

Yes. Langfuse's code is public under the MIT licence, so you can run it on your own server.

Host it on a serverHostinger, Railway and Elestio set it up on a server for you with a one-click install.

Hosting with

What are the best Langfuse alternatives?

Langfuse is an open source alternative to Lunary, Confident AI, Openlayer and 2 more. Helicone does the same job and is open source too.

LunaryPaid

Monitoring, analytics and prompt management for agents.

Confident AIFree

Live traces turned into test cases for LLM apps.

OpenlayerFree

AI governance with evaluations, tracing, guardrails and compliance tracking.

Orq.aiFree

Agents built and evaluated with real-time tracing.

Splunk Agent ObservabilityFree

AI agent tracing and evaluations in Splunk Observability Cloud, formerly Galileo.

HeliconeOpen Source

LLM usage routed, debugged and analysed.

Questions about Langfuse