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Postman vs Nightingale: catalog facts
Postman	Nightingale
Freemium A free tier covers individual use with limits on collaborators, collection runs and…	Free Available from the Microsoft Store and GitHub releases.
Windows, macOS, Linux, Web, Browser extension	Windows
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 Windows app that is light on resources Variables and environments
Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions	Windows only Smaller feature set than larger API platforms
Downloadable app, Web application, Browser extension	Downloadable app
Closed source	Closed source
License not stated	License not stated
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 1, 2026

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