Alternatives to Responsive Design Checker
A free browser tool that previews a website at mobile, tablet and desktop screen sizes. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Responsive Design Checker
A free browser tool that previews a website at mobile, tablet and desktop screen sizes.
Replacements
Listings that take over the same core job as Responsive Design Checker.
Screenfly
A free online tool that shows a website at the screen sizes of phones, tablets, desktops and TVs.
Screenfly covers phone, tablet, desktop and TV screen sizes for free without the five-requests-per-five-minutes limit.
BrowserStack Responsive
A free web tool that previews how a website looks across real device screen sizes.
BrowserStack Responsive previews pages on real device screens rather than simulated viewports, with deeper features on BrowserStack's paid plans.
LT Browser
A desktop browser for building, testing and debugging responsive websites across many device viewports side by side.
LT Browser is a desktop app for Windows, macOS and Linux with 50+ device presets side by side, and it handles sites that block iframes.
MobileTest.me
A web tool that previews a website inside smartphone and tablet emulator frames.
MobileTest.me shows sites inside phone and tablet emulator frames, though its device list is old and omits current phones.
Am I Responsive
A web tool that shows a site on desktop, laptop, tablet and phone mockups at once.
Am I Responsive renders four device mockups in one shareable image and supports localhost, but uses fixed Apple-modelled viewports.
BrowserStack Live
A cloud service for testing websites by hand in real desktop and mobile browsers on real devices.
BrowserStack Live is a paid service for manual testing on real browsers and devices, including local sites, instead of simulated previews.
Also worth comparing
These listings name Responsive Design Checker as their own alternative, so the relationship runs both ways.
EXPERTE Bulk Mobile Friendly Test
A free online test that checks many pages of a website for mobile-friendliness at once.
Responsive Design Checker previews one site at mobile, tablet and desktop sizes for manual review, and is limited to five requests every five minutes.
Similar software
Related functionality, not a direct replacement.
