Alternatives to Screenfly

A free online tool that shows a website at the screen sizes of phones, tablets, desktops and TVs. The listings below can replace it for an important use case. Each note says what changes if you switch.

  • Screenfly

    A free online tool that shows a website at the screen sizes of phones, tablets, desktops and TVs.

    FreeProprietaryWeb

Replacements

Listings that take over the same core job as Screenfly.

  • Responsive Design Checker

    A free browser tool that previews a website at mobile, tablet and desktop screen sizes.

    FreeProprietaryWeb

    Responsive Design Checker also previews simulated screen sizes in the browser for free, but it limits use to five requests every five minutes and lacks TV sizes.

  • BrowserStack Responsive

    A free web tool that previews how a website looks across real device screen sizes.

    FreemiumProprietaryWeb

    BrowserStack Responsive previews pages on real device screens rather than resized views, with deeper testing features behind BrowserStack's paid plans.

  • Am I Responsive

    A web tool that shows a site on desktop, laptop, tablet and phone mockups at once.

    FreeProprietaryWeb

    Am I Responsive shows four fixed Apple-style device views in one presentable image and works with localhost URLs, but its author says it is not a testing tool.

  • MobileTest.me

    A web tool that previews a website inside smartphone and tablet emulator frames.

    FreeProprietaryWeb

    MobileTest.me shows the site inside phone and tablet emulator frames, but its device list is old and it drops the desktop and TV sizes Screenfly covers.

  • LT Browser

    A desktop browser for building, testing and debugging responsive websites across many device viewports side by side.

    FreemiumProprietaryWindowsmacOSLinux

    LT Browser is a freemium desktop app for Windows, macOS and Linux with over 50 device presets side by side, and it works with sites that block iframes.

Also worth comparing

These listings name Screenfly 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.

    FreeProprietaryWeb

    Screenfly shows a page at phone, tablet, desktop and TV screen sizes for visual inspection, one page at a time instead of testing up to 500 pages.

Similar software

Related functionality, not a direct replacement.

  • BrowserStack Live

    A cloud service for testing websites by hand in real desktop and mobile browsers on real devices.

    PaidProprietaryWeb

  • TestMu AI

    A cloud testing platform, formerly LambdaTest, for cross-browser, automated and AI-assisted testing of web apps.

    FreemiumProprietaryWebCommand line