The Modern API Laboratory
Design, test, and debug your API workflows with a fast, open-source tool built for the modern web. Experience a beautiful, monochromatic interface that gets out of your way.
Core Features
Everything you need for API development
Built with performance and user experience in mind. Yasumu removes the clutter so you can focus on the data.
Lightweight & Fast
Built with Tauri and Deno runtime for lightweight and better performance compared to traditional Electron-based alternatives.
Clean Interface
A distraction-free, monochromatic environment inspired by modern design principles.
Offline First
Your data stays on your machine. No cloud sync required. Complete privacy.
Scripting
Write scripts to automate your workflows. Use the built-in script editor to write scripts for your requests.
Git-Friendly Workspaces
Yasumu workspaces are git-friendly. Commit and share your workspaces with your team easily.
Open Source
100% free and open source. Contribute on GitHub and help shape the future of API testing.
Proudly Open Source
Yasumu is built on the shoulders of giants. We leverage the power of modern web technologies to deliver a native-like experience.