Multi Device Simulator — Mobile Responsive Testing & Recording

Preview and record any site on up to four mobile devices at once — real phone and tablet viewports, scrolling together.

See your website on every phone at once, turn any page into a mobile storyboard, and hand your team a review they can act on. Multi Device Simulator opens the page you are on inside realistic iPhone, Android and tablet frames, live and interactive, right in the same tab. Your original page stays exactly as it was. ■ PREVIEW ON UP TO 4 DEVICES AT ONCE • Put an iPhone, a Galaxy, a Pixel and an iPad side by side and watch your layout respond on each one. • Sync scroll: scroll one device and every other device follows. • Live and interactive: tap, type, follow links and fill in forms, exactly as on the real site. • Each device asks the site for its mobile page, so sites that serve different mobile markup show the right version. • Rotate any device between portrait and landscape in one click. ■ 68 REAL DEVICE FRAMES • 30 iPhones, from iPhone 5 to iPhone 17 Pro Max. • 32 Android phones, including Samsung Galaxy, Google Pixel and Xiaomi. • 6 tablets, including iPad Mini, iPad Air, iPad Pro and Galaxy Tab. • True viewport sizes and pixel ratios, with accurate device artwork. • Search the library by name, or by a width such as 390. ■ SMART STORYBOARDS • One click turns a whole page into a numbered set of mobile screens. • Smart Capture splits the page between sections, never through a headline. • Controlled overlap keeps the context between one screen and the next. • Sticky headers can be shown once rather than on every screen. • Every screen is labelled with its section, so a long page reads like a story. • Download a single screen, or the whole storyboard as a ZIP. ■ REVIEW, COMMENT AND FLAG ISSUES • Open any storyboard in the Playground review workspace. • Mark up a screen with pins, boxes, circles and arrows. • Comment on a mark, or on the whole screen. • Turn a comment into an issue and rate it Blocker, Major or Minor. • Filter the run to just the screens with open issues. ■ SHARE WITH YOUR TEAM • Everything: a ZIP with the annotated screens, the report and the data. • Report only: a Markdown report that pastes straight into a ticket. • Data only: JSON, for your own tools. • Every finding records which screen, where on it, and how severe. ■ RECORD THE PHONE • Record just the device, or the whole tab, as a video. • Include the page's own sound if you want it. • Pro adds HD recording at full device resolution, microphone narration and unlimited length. ■ KEYBOARD SHORTCUTS • Alt+Shift+M: open the current page in the simulator • Alt+Shift+S: capture the page • Alt+Shift+R: start or stop recording the phone ■ PRIVATE BY DESIGN • Your screenshots, storyboards, comments and recordings are saved on your own computer. They are never uploaded. • No account is needed to use the free features. • Signing in with Google is only for Pro, and only your name, email address and profile picture are used. ■ FREE AND PRO Free, always: • One page of one site, fully storyboarded and reviewed • Every device released up to 2024 • Marks, comments and issues • Export as Markdown, JSON or ZIP • Recordings up to 60 seconds Pro, $3.99 per month: • Every page of every site • The latest devices, including iPhone 17 • Every screen size in one capture • HD recording, microphone narration and no time limit ■ GOOD TO KNOW • Pages render with Chrome's own engine. iPhone presets match the real iPhone's screen size, pixel ratio and user agent, but they are not Safari. • When you make a full-page storyboard, Chrome briefly shows a "started debugging this browser" bar. That is Chrome's own notice while the extension measures the page; it disappears as soon as the capture finishes. Questions or feedback: hello@skelna.com