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.
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.
Syncs all your actions
Interacting with one viewport means interacting with all of them. It just works.
Edit all panes at the same time
Make changes to all panes at once using our Live CSS editor.
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.
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.
Powerful developer tools
Developer tools like you're used to from Chromium, with support for devtools extensions like React, Vue, Angular, Svelte and more.
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.
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.
Documentation on the side
Quickly show documentation or references in the side browser, so you don't have to lose sight of your project.
Handoff right where you need it
Your favorite handoff tools live right inside Polypane, side-by-side with your site or app.
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.
Social media previews and meta info
Live previews of how your site looks when shared on social media, and all your meta information visible.
Build pixel perfect sites
Compare an image with the expected design to your live site with different comparison modes built right in.
* 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.
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.
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.
And much more
Light and dark modes
Polypane comes in a light and dark theme, so it always fits in with your desktop.
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.
Building responsive websites is hard. Polypane makes it easy.Try for free
Praise for Polypane
Polypane is easily one of the most useful tools for modern web designers and developers.
Polypane are building a smart design environment where you can preview your designs across a multitude of browsers, devices and viewports.
Discovering Polypane was a game-changer to how I develop responsive websites. I couldn't imagine going back to using the Chrome inspector.
If you’re developing a website, Polypane comes in quite handy. Already an essential tool.
An invaluable tool for responsive website testing. A must-have for front-end developers.
Polypane quickly became an indispensable part of my workflow. With a tool like this, you have no excuse not to create great, responsive experiences!
A vital part of the web development toolkit for testing and troubleshooting responsive design.
Hi! I'm Kilian, the creator of Polypane.
Like you, I'm a web developer. In nearly 20 years of creating websites and apps for the web, I've built many open source apps and libraries. I write about them and other things that interest me on my blog.
I'm building my own browser.
Before I started doing that, I ran an internet agency. I constantly felt pressure from clients to develop sites faster and here I was, resizing my browser to work on each screen size one-by-one. I was wasting so much time just resizing my browser.
More than that, I saw many opportunities to make the process so much better, to make a browser that works for me instead of against me. So that is my goal: the ultimate browser for developers and designers. I hope you'll check out Polypane and help me make that a reality.
Polypane can easily cut your development time in half, and I'm just getting started.
Building responsive websites is hard.
Polypane makes it easy.