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CarteroPostman
Free

Free and open source under the GPL-3.0-or-later licence.

 Freemium

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

Linux Windows, macOS, Linux, Web, Browser extension
  • Native and lightweight, not a web app
  • No account or cloud subscription required
  • 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
  • Fewer features than large API platforms
  • Linux is the platform confirmed in the research
  • 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: GPL-3.0-or-later License not stated
No account needed Account needed
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.