Used by teams worldwide

Your site is visited on many different devices. Polypane lets you built on them, too.

Stop resizing your browser

Emulate real devices, use your CSS breakpoints or pick your own dimensions. No resizing needed.

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Get the full overview, your way

Line your viewports up horizontally or vertically, focus in on a single viewport in focus mode or get the classic browser style in our full mode. Your choice.

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Sync all your actions

Scrolling, clicks, navigation, hover styles and form input are automatically synced between all panes. Easily verify that your site works as intended on all viewports.

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Everything you need to make great web experiences in a single app.

Edit all panes at the same time

Make changes to all panes at once using our Live CSS editor.

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Emulate popular devices

Checking to see if your site or app renders well on user devices becomes easy and fast with the built-in list of popular device emulators. With full touch support.

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Detect CSS breakpoints. Automatically

Use the CSS breakpoints in your stylesheets to automatically generate viewports for every view your site supports.

One click gives you a full overview of your CSS breakpoints, or a simplified view that covers the full range of your site.

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Build pixel perfect sites

Compare the expected design to your live page with different comparison modes built right in.

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* We think sites don't have to be pixel perfect but getting close is nice

Live reloading built in

Your page will automatically refresh whenever you change a file. CSS and images are updated without a page refresh, like magic.

You can also automatically reload the page at a set interval and other hot reloading tools work great with Polypane too.

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Full page screenshots

You want best in class screenshots, and we have them. No other browser comes close in terms of rendering accuracy. We also support screenshots of all your viewports.

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Handoff right where you need it

Your favorite handoff tools live right inside Polypane, side-by-side with your site or app.

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Debugging an issue becomes quick and easy.

Powerful developer tools

Developer tools like you're used to from Chromium, with support for devtools extensions like React, Vue, Angular, Svelte and more.

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Your favorite DevTools extensions

Install and use your favorite Chromium devtools, with support for React DevTools, Vue.js DevTools, Redux DevTools, Angular, Svelte and many more.

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Testing takes minutes instead of days.

More than just responsive design tools

Over 15 overlays let you easily check contrast and accessibility, edit your page visually, test for visual impairments and more.

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Social media previews and meta info

Live previews of how your site looks when shared on social media, and all your meta information visible.

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Light and dark modes

Polypane comes in a light and dark theme, so it always fits in with your desktop.

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Zoom your entire browser

Sometimes you just need to fit a 4K screen and an iPhone side by side. Zoom individual panes, or your entire browser, to get the view you need.

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And much more

  • Customizable device presets
  • Works perfectly with hot reloading tools
  • Clean UI mode for screencasts and demos
  • Powerful testing with custom HTTP headers
  • Layout stress-testing with random pane sizes
  • Keyboard shortcuts for everything
  • Reorder, resize and zoom individual panes
  • Store your favorite panes in Workspaces
  • Monthly updates

Polypane has all the tools you need to build great web experiences

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On Mac, Windows & Linux
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