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ATACPostman
Free

Free and open source under the MIT licence.

 Freemium

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

Windows, macOS, Linux, Command line Windows, macOS, Linux, Web, Browser extension
  • Full API client inside the terminal
  • Optional Vim key bindings
  • 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
  • Still working toward its 1.0 release
  • No graphical interface for people who prefer a mouse
  • 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 September 23, 2026

Checked September 21, 2026

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