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BrowserStack Responsive vs Screenfly: catalog facts
BrowserStack Responsive	Screenfly
Freemium The responsive checker is free; BrowserStack's wider testing products are paid.	Free Free to use in the browser.
Web	Web
Previews pages on real devices rather than resized frames Covers many screen sizes and resolutions at once	Covers phone, tablet, desktop and TV screen sizes Nothing to install
Deeper testing features sit behind BrowserStack's paid plans Only tests publicly reachable pages	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
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.