Great companies use Polypane

Never resize your browser again

Emulate real devices, use your responsive 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. Scrolling, hovers, clicks and forms, it just works.

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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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Device emulation like you've never seen

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.

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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.

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Make your browser work for you

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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Handoff right where you need it

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

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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. That's right, there's a browser in our browser.

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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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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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Debugging an issue becomes quick and easy.

Custom 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

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.

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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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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

Unlimited Screens
Scroll Syncing
Keyboard Syncing
Device Presets
Freeform Resizing
Developer tools
Social Media previews
Horizontal Mode
Device emulation
Vertical Mode
Handoff support
Live Reloading
Accessibility Debugging
Focus Mode
Live CSS Editing
Full Mode
Color Blindness Simulators
Full Page Screenshots
Image Comparison
CSS Breakpoint Detection
Overview Screenshots
Touch emulation
Devtools Extensions
Custom Headers
Dark Mode
…And more to come!

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

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On Mac, Windows & Linux

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