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Langfuse

by langfuse

Open-source LLM engineering platform — tracing, prompt management, evaluations, datasets, playground.

⭐ 11,000 stars🍴 0 forksTypeScriptobservabilityanalyticsprompts
Start hereRead the setup guide →Install steps and usage, straight from the docs.Source codeDownload ZIPLatest commit on default branch.SourceView on GitHubgithub.com/langfuse/langfuse
Project site: langfuse.com

About Langfuse

Langfuse is a TypeScript open-source llm evals project by langfuse. Open-source LLM engineering platform — tracing, prompt management, evaluations, datasets, playground. With 11,000 GitHub stars and 0forks, it's one of the LLM Evals tools worth knowing. You can download the source, browse it on GitHub, or read the full setup guide in the README below.

From the project README

<img width="2400" alt="hero-b (1)" src="https://github.com/user-attachments/assets/5810ae13-15d6-4b60-afd2-927adc501861" />

<div align="center"> <div> <h3> <a href="https://cloud.langfuse.com"> <strong>Langfuse Cloud</strong> </a> · <a href="https://langfuse.com/docs/deployment/self-host"> <strong>Self Host</strong> </a> · <a href="https://langfuse.com/demo"> <strong>Demo</strong> </a> </h3> </div>

<div> <a href="https://langfuse.com/docs"><strong>Docs</strong></a> · <a href="https://langfuse.com/issues"><strong>Report Bug</strong></a> · <a href="https://langfuse.com/ideas"><strong>Feature Request</strong></a> · <a href="https://langfuse.com/changelog"><strong>Changelog</strong></a> · <a href="https://langfuse.com/roadmap"><strong>Roadmap</strong></a> · </div> <br/> <div> </div> </div>

MIT License Y Combinator W23 Docker Pulls

This is an excerpt from the project's own README, quoted here for reference. Read the full README on GitHub →

Langfuse — FAQ

What is Langfuse?

Open-source LLM engineering platform — tracing, prompt management, evaluations, datasets, playground.

Is Langfuse free to use?

Yes. Langfuse is open-source and free. You can browse the source on GitHub or download it here at no cost — no signup required.

How do I install and run Langfuse?

Download the latest source as a ZIP from GitHub (or clone the main branch), then follow the setup steps in the README below.

What language is Langfuse written in?

Langfuse is primarily written in TypeScript.

How popular is Langfuse?

Langfuse has 11,000 stars and 0 forks on GitHub — a useful signal of how actively it's maintained and trusted by developers.

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