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WebSocket KingBruno
Free

Free to use in the browser.

 Freemium

Most features are free and open source under the MIT licence. Paid editions add features…

Web Windows, macOS, Linux
  • Nothing to install
  • Focused on WebSocket testing and debugging
  • Collections are plain files, so Git does the versioning and sharing
  • Offline only, with the project committing to never adding cloud sync
  • WebSockets only, not a general HTTP client
  • Little public documentation about its features
  • Some team features are paid
  • The Bru markup is a format specific to Bruno
Web application Downloadable app
Closed source Open source
License not stated License: MIT
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 24, 2026

Checked September 21, 2026

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