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ResonancePostman
Free

Free and open source under the MIT licence.

 Freemium

A free tier covers individual use with limits on collaborators, collection runs and…

Linux Windows, macOS, Linux, Web, Browser extension
  • No account, cloud sync or telemetry
  • Collections stored as plain YAML files
  • The most widely used API client, so collections and tutorials for it are everywhere
  • Collections with environments, pre-request and test scripts, and a built-in runner
  • Younger and smaller than Postman or Insomnia
  • No built-in sync for sharing collections across a team
  • Built around a cloud workspace, and an account is effectively required
  • Offline and local-only use has become harder over successive versions
Downloadable app Downloadable app, Web application, Browser extension
Open source Closed source
License: MIT License not stated
No account needed Account needed
Not stated if it works offline Needs internet

Checked October 1, 2026

Checked September 21, 2026

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