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Postman vs Cartero: catalog facts
Postman	Cartero
Freemium A free tier covers individual use with limits on collaborators, collection runs and…	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux, Web, Browser extension	Linux
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	Native and lightweight, not a web app No account or cloud subscription required
Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions	Fewer features than large API platforms Linux is the platform confirmed in the research
Downloadable app, Web application, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Account needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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