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