Building great web experiences is frustrating and complex. Polypane makes it easy.

A developer browser to develop, debug and test sites and apps twice as fast. Bring your favorite code editor and let Polypane take care of the rest. Make your sites and apps work everywhere and for everyone.

Screenshot of the Polypane application
Screenshot of the Polypane application

Used by teams worldwide

Polypane shows your site in multiple viewports at once and keeps them all in sync while you work.

Develop responsive websites and apps twice as fast and get better results, because you wont be skipping screen sizes and wishing for the best.

Build higher quality websites, whether you use Wordpress, React, Angular, Svelte, Bootstrap, Drupal or any other CMS, library or framework.

Polypane has the right tools built-in for developing, debugging and testing, like devtools extensions, live reloading, accessibility testing and more.

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

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

Never resize your browser again

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

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Syncs all your actions

Interacting with one viewport means interacting with all of them. It just works.

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Edit all panes at the same time

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

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

Detect CSS breakpoints. Automatically

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

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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 devtools, with support for React DevTools, Vue.js DevTools, Redux DevTools, Angular, Svelte and many more.

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Built-in live reloading

Live reloading for any development environment, from plain HTML to Wordpress to React or Vue. CSS and images even update without page refresh.

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Documentation on the side

Quickly show documentation or references in the side browser, so you don't have to lose sight of your project.

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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.

Debug tools for each pane

Over 15 overlays let you easily check contrast and accessibility, edit your page visually and get insights into your page structure.

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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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Build pixel perfect sites

Compare an image with the expected design to your live site with different comparison modes built right in.

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

Testing takes minutes instead of days.

See like your users

Our overlays quickly let you check color blindness and other visual impairments, like cataracts, bright sunlight or a device with night mode.

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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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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 and network throttling.

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And much more

Light and dark modes

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

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Everything you need to make awesome web experiences

Live reloading, touch and mobile emulation, dev tools extensions, workspaces and css breakpoint detection. Polypane has it all.

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

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On Mac, Windows & Linux

Developers and designers love Polypane

Here's what they have to say:

Polypane is easily one of the most useful tools for modern web designers and developers.

Stephen HayAuthor of Responsive Design Workflow

It is convenient seeing your work in multiple responsive views at the same time. Love it, đź’Ż

Sara SoueidanIndependent front-end UI engineer, Speaker/Trainer

Polypane are building a smart design environment where you can preview your designs across a multitude of browsers, devices and viewports.

Colm TuiteCreator of Modulz

Discovering Polypane was a game-changer to how I develop responsive websites. I couldn't imagine going back to using the Chrome inspector.

Julian KeenaghanCTO at Beam

If you’re developing a website, Polypane comes in quite handy. Already an essential tool.

Roy van RooijenDesign Tools Network

An invaluable tool for responsive website testing. A must-have for front-end developers.

Marc BergerWeb Developer

Polypane quickly became an indispensable part of my workflow. With a tool like this, you have no excuse not to create great, responsive experiences!

Richard GoodwinDeveloper & Podcaster at Comedywham

A vital part of the web development toolkit for testing and troubleshooting responsive design.

John CamachoWeb Developer at Pixelstation

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Building responsive websites is hard.
Polypane makes it easy.

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