A responsive viewer that loads every device at once

DevTools shows one viewport at a time. Hoverify's responsive viewer puts every device you've picked on screen together, and a scroll, a click or a line typed into a form on any one of them carries across the rest.

Not in the sense of running iOS or Android. A mobile simulator Chrome extension, whatever it calls itself, renders pages in the browser you already have, and Hoverify is no different. Each device loads at its real viewport, in its frame, with Safari's or Chrome's bars around it. Scripts on the page read that device's screen size and orientation, along with the user agent you picked. In Chrome, Edge and other Chromium browsers your mouse also becomes a finger while a mobile user agent is set. A press sends touch events and a drag scrolls the page. That catches layout breaks, overflow, menus that only open on touch and tap targets that are too small. It won't catch a bug that only shows up in Safari's rendering engine. No extension can reach that far, so keep a real device in the loop before you ship.

34 presets ship with the extension. The iPhones are the 18 Pro and 18 Pro Max, 17, 17 Pro and 17 Pro Max, Air, 17e, 16, 16 Plus and the SE (3rd generation). On Android there's the Galaxy S26, S26 Ultra, A17 5G and A07, Pixel 11 and 11 Pro XL, Redmi Note 14 4G and Moto G Power (2025). Four are foldables, the iPhone Duo, Galaxy Z Fold7, Galaxy Z Flip8 and Pixel 10 Pro Fold, and all but the Flip8 have a button that switches between the folded and unfolded screen. For tablets you get the iPad Pro 13-inch and 11-inch (M5), iPad Air 13-inch (M4), iPad (A16), iPad mini (A17 Pro), Galaxy Tab S11 and the older 768×1024 iPad. Tailwind's five breakpoints make up the rest. Add your own profile for anything that isn't there.

Yes. Most responsive checker extensions load your page in an iframe, which fails on sites that send X-Frame-Options or a frame-ancestors policy. Hoverify can inject the viewer straight into the page instead, so those sites still render.

One device per click. Each device on the board has a Capture button with two choices, the visible viewport or the full scrollable page. Either way the page loads at that device's screen size with the board's user agent, and a mobile layout stays mobile in the shot. Viewport shots also include the frame and browser bars you see on the board. The shots collect in one sheet as you take them. There you can retake or drop a device, draw on a shot with the same annotation tools Capture has, save it as PNG, JPEG or WebP, copy it, or download the whole set as a zip. Any shot can also go to the screenshot editor.

Yes. Zoom the board out and the devices scale with it, so a 2560px viewport is testable on a laptop screen. There's also a single-viewport mode where you drag the edges to any width and height you want.

Chrome and Firefox, plus Edge, Brave and the other Chromium browsers, which install the Chrome build. The responsive viewer Chrome extension and the Firefox add-on are the same tool, and one license covers them both. The difference is touch. Desktop Firefox has no touch events for the extension to send. Your mouse stays a mouse there. Scripts see the device's screen size and user agent from Firefox 128 on.

The viewer is one of Hoverify's nine tools, and Hoverify is paid, with a 14-day refund behind it. Run it against your own breakpoints for a fortnight and you can still back out. That refund is what replaces a free tier. One license covers 3 browsers at a time, and it never renews on its own. See the pricing.