The browser for building and testing responsive sites

Create and test responsive websites and apps twice as fast, directly on your desktop.

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On Mac, Windows & Linux

Screenshot of the Polypane application
Screenshot of the Polypane application

Creating high-quality websites is a lot of work

Your favorite code editor and design software help you get work done. So should your browser.

A browser that does things no other browser does.

View sites in multiple devices side by side, all live and on your own machine. Get an overview of your site's CSS media queries and debug them using powerful built-in tools like layout debugging, live reloading & browser devtools.

It's like Browsersync and Chrome mashed together, with extra features to help you make the best website or web app possible.

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Discovering Polypane was a game-changer to how I develop responsive websites. Being able to see how my site looks at multiple breakpoints offers a completely different perspective to my workflow. I couldn't imagine going back to using the Chrome inspector.

Increase your productivity & quality of output

See what Polypane does

Get a true overview of your website or webapp

View multiple panes side-by-side to make sure your site or app looks great everywhere. Panes can be popular devices like phones and tablets, your own CSS breakpoints or any size you need them to be.

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Sync all your actions

Interacting with one device means interacting with all of them. All your mouse and keyboard interactions are synced between all panes. That means scrolling, clicks, page navigation, hover styling and form filling. It just works.

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Detect CSS breakpoints. Automatically

Get an overview of your CSS Media queries and turn them into viewports for every size your site supports.

Polypane intelligently parses your CSS to give you better insight into the style of your website or webapp. No other browser does this.

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True full page screenshots

Getting sign-off on an implementation is easier than ever. Creating a screenshot of all your panes, a specific part of a page or the entire page takes just a single click. Then send it over to get the OK you want.

Polypane's screenshots are best in class. No one handles viewport units and fixed element as well as us.

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Powerful devtools

Polypane has your back when it comes to developing websites. Layout debugging, CSS stress-testing & powerful Chromium devtools with your favorite devtools extensions like the React or Vue devtools. Polypane has all the tools you need to create modern websites and apps built right into the browser.

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Live reloading built in

With the built-in live reloading, you no longer have to manually reload. Pages will automatically refresh whenever you change a file.

CSS and images are updated without a page refresh, like magic.

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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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That's not all

With more features like focus mode, layout debugging, customisable presets, workspace favorites and global zooming, Polypane offers everything you need.

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Build high quality websites in half the time

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On Mac, Windows & Linux

Trusted by teams worldwide

Firstversionist creates software used by companies like:


Designers should confront themselves with the reality of different viewports as early and often as possible. Polypane encourages this behaviour, and makes it easy to do. It's easily one of the most useful tools for modern web designers and developers.

Stephen HayAuthor of Responsive Design Workflow

Polypane are building a smart design environment where you can preview your designs across a multitude of browsers, devices and viewports. Another example of a workflow which considers the full context of the target medium.

Colm TuiteCreator of Modulz

If you’re developing a website, Polypane comes in quite handy. Test multiple viewports at the same time, no more browser window resizing, and keep all panes in sync when scrolling in one view. In beta, but already an essential tool.

Roy van RooijenDesign Tools Network

Build high quality websites in half the time

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