Product
Langfuse
Langfuse is an open-source AI app, launched in 2023, made for developers and businesses.
An open-source platform for tracing, evaluating and monitoring LLM apps and agents.
Main jobs: Evaluate and trace LLM apps. It is open source and free to use. You can use it in the browser, on your own server and through an API.
Markdown version of https://godooo.ai/en/product/langfuse. Every page on this site has one: add .md to its address.
At a glance
- Type
- Product
- Launched
- 2023
- Galaxy
- Models & APIs
- Pricing
- Open source, free
- Open source
- Yes
- Source code
- github.com/langfuse/langfuse
- GitHub stars
- 35,004
- How you run it
- Web · Self-host · API
- Made for
- Developers · Businesses
- Website
- langfuse.com
What it can do
Evaluate and trace LLM appsmain jobunconfirmed
“Trace, evaluate, and improve AI agents with one open platform.”— langfuse.com, 2026-09-24
Prompt optimizationsupportedunconfirmed
“Prompt Management helps you centrally manage, version control, and collaboratively iterate on your prompts.”— github.com, 2026-09-24
unconfirmedproposed by a machine, awaiting calibration
Alternatives
- PhoenixOpen source, freeAlso does: Evaluate and trace LLM apps, Prompt optimization; runs offline
- DeepEvalOpen source, freeAlso does: Evaluate and trace LLM apps
- promptfooOpen source, freeAlso does: Evaluate and trace LLM apps; runs offline
- RagasOpen source, freeAlso does: Evaluate and trace LLM apps; runs offline
- Pydantic AIOpen source, freeAlso does: Evaluate and trace LLM apps; runs offline
Connections
- Integrates with
- LangChain·LlamaIndex
Questions
What is Langfuse?
Langfuse is an open-source AI app, launched in 2023, made for developers and businesses. An open-source platform for tracing, evaluating and monitoring LLM apps and agents.
Is Langfuse free?
Yes. Langfuse is open source and free to use.
Is Langfuse open source?
Yes. The source code is at https://github.com/langfuse/langfuse.
Can Langfuse run locally?
Langfuse can be self-hosted on your own server.
What can Langfuse do?
Main jobs: Evaluate and trace LLM apps. It can also do: Prompt optimization.
What are open-source alternatives to Langfuse?
Open-source ones: Phoenix, DeepEval, promptfoo, Ragas and Pydantic AI.
Sources
- langfuse.com/checked 2026-09-24
- github.com/langfuse/langfusechecked 2026-09-24