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Responsive Design Checker vs BrowserStack Responsive: catalog facts
Responsive Design Checker	BrowserStack Responsive
Free Free to use.	Freemium The responsive checker is free; BrowserStack's wider testing products are paid.
Web	Web
Previews several screen sizes from one page Nothing to install	Previews pages on real devices rather than resized frames Covers many screen sizes and resolutions at once
Limited to five requests every five minutes Simulated viewports, not real 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
Needs internet	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.