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Am I Responsive vs Screenfly: catalog facts
Am I Responsive	Screenfly
Free Free to use.	Free Free to use in the browser.
Web	Web
Four device views in one presentable image Works with localhost URLs	Covers phone, tablet, desktop and TV screen sizes Nothing to install
Not a testing tool, by the author's own description Fixed viewports modelled only on Apple devices	Shows resized views rather than rendering on real devices Only useful for 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.