The perfect browser for web developers and designers.

Never resize your browser again

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

Syncs all your interactions

Your keyboard and mouse interactions are synced between all viewports. Scrolling, hovers, clicks and form input, you only need to do it once.

Powerful developer tools

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

Device emulation, without the hassle

Emulate popular devices with a single click. Touch emulation, toggle network conditions, switch between light and dark modes on the fly and send custom headers for each pane.

Dark mode media query ready

Develop your site in light and dark mode at the same time, both in view and synced together. There is no faster way to build sites with dark and light mode.

Edit all panes at the same time

Make changes to all panes at once using our Elements panel and Live CSS editor. We'll automatically import any Google font you use for quick prototyping.

Get the full overview, your way

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

Handoff right where you need it

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

Documentation on the side

Quickly show documentation or references in the side browser, so you don't have to lose sight of your project. That's right, there's a browser in our browser.

Detect CSS breakpoints
Automatically

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

Intelligent Live and Hot reloading
For everyone

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

Custom debug tools for each pane

Over 25 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. All your meta information is visible so you catch typos and missing info in a glance.

Let your browser tell you which links are broken.

Polypane automatically checks all the links on your page and if they're broken, redirect or have referrer issues, we'll let you know.

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.

See like your users do

Test your website with many different visual impairment simulators, like color blindness and cataracts but also situational impairments like bright sunlight or devices 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.

Compare full page screenshots

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.