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Postman vs TestMace: catalog facts
Postman	TestMace
Freemium A free tier covers individual use with limits on collaborators, collection runs and…	Free Distributed as freeware.
Windows, macOS, Linux, Web, Browser extension	Windows, macOS, Linux, Command line
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	Graphical test editor alongside JavaScript tests Variables, authentication and API import
Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions	Closed source The site gives no release dates or changelog
Downloadable app, Web application, Browser extension	Downloadable app
Closed source	Closed source
License not stated	License: Freeware
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

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