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BrowserStack Responsive vs Am I Responsive: catalog facts
BrowserStack Responsive	Am I Responsive
Freemium The responsive checker is free; BrowserStack's wider testing products are paid.	Free Free to use.
Web	Web
Previews pages on real devices rather than resized frames Covers many screen sizes and resolutions at once	Four device views in one presentable image Works with localhost URLs
Deeper testing features sit behind BrowserStack's paid plans Only tests publicly reachable pages	Not a testing tool, by the author's own description Fixed viewports modelled only on Apple devices
Web application	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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