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VoidenHoppscotch
Free

Free and open source.

 Freemium

Free and open source under the MIT licence, including self-hosting. A paid cloud plan…

Windows, macOS, Linux Windows, macOS, Linux, Web, Self-hosted, Browser extension
  • Requests and docs stored as plain Markdown files in Git
  • Works offline with no account or cloud
  • Opens in a browser tab with nothing to install
  • HTTP, GraphQL, WebSocket, Server-Sent Events, Socket.IO and MQTT
  • Uses its own .void file format
  • Younger project than established API clients
  • The browser version needs an extension or the desktop app to reach local services
  • Team collaboration features are the paid part
Downloadable app Web application, Downloadable app, Self-hosted, Browser extension
Open source Open source
License not stated License: MIT
No account needed No account needed
Works offline Works offline

Checked October 1, 2026

Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.