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Responsive Design Checker vs Am I Responsive: catalog facts
Responsive Design Checker	Am I Responsive
Free Free to use.	Free Free to use.
Web	Web
Previews several screen sizes from one page Nothing to install	Four device views in one presentable image Works with localhost URLs
Limited to five requests every five minutes Simulated viewports, not real devices	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.