The browser for developing responsive & accessible websites.

Developing and designing just got easier. The most powerful browser for web developers. Available on all platforms.

Great companies using Polypane

Everything you need to test in one, single tool.

Dozens of tools that help you build responsive, accessible and fast websites.

Viewport Sizes

From mobile screens to 5K monitors, get all viewports in one screen.


Over 80 accessibility rules, 14 different emulators and 10+ tools.

Side by side

Dark and light, reduced motion, print. No more manually switching around!

Responsive design has never gone faster

Viewport sizes

Mobile screens, 5K monitors, all your CSS breakpoints or any freeform size. All viewports in one screen, no resizing needed.

Syncs all your interactions

Scrolling, clicking, hovering and typing, it happens in all screen sizes automatically.

Edit all viewports in one go

Make changes to all viewports at once using our Element inspector and Live CSS editor.

Developers and designers love Polypane

Here's what they say:

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

Stephen Hay Author of Responsive Design Workflow

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

Sara Soueidan Independent front-end UI engineer, Speaker/Trainer

This thing is FAST and the synchronized scrolling works amazingly. Prepare to be impressed.

Vivian Guillen Frontend Developer & Curator at Tailwind Weekly

Polypane is fast, helps me catch issues and the meta information preview is awesome.

Graeme Fulton Founder at Letter

Using Polypane and woah this is awesome! It’s really slick and fast! I was just 5 minutes in and I already fixed a bug.

Sergio Mattei Founder at Makerlog

Polypane is a smart design environment where you can preview your designs across devices and viewports.

Colm Tuite Creator of Modulz

Read more testimonials

Social media previews

Pixel-perfect previews of your social media sharing cards. Tips on how to improve them included.

Intelligent Live and Hot reloading
For everyone

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

Powerful developer tools

The same Developer tools as Chromium. Including support for extensions like React, Vue, Angular, Svelte and more.

Dark mode

Test light and dark mode side-by-side while you build your site. No more manually switching around!

Full page screenshots

Full page screenshots tuned to get the highest rendering accuracy of any browser.

…And that's not all

Polypane has everything you need to make awesome web experiences.

Unlimited Screens
Scroll Syncing
Hover syncing
Grid overlays
Keyboard Syncing
Device Presets
Freeform Resizing
Horizontal Overflow detection
Developer tools
Pixel-perfect Social Media previews
Horizontal Mode
Device emulation
Vertical Mode
Handoff support
Live Reloading
Accessibility Audits
Focus Mode
Page outlines
Live CSS Editing
Full Mode
Color Blindness Simulators
Full Page Screenshots
Visual design diffing
CSS Breakpoint Detection
Overview Screenshots
Touch emulation
Devtools Extensions
Custom Headers
Dark Mode
…And more to come!

Full product tour

Build your next project with Polypane

  • All plans, all features
  • On Mac, Window and Linux
  • 14-day free trial – no credit card needed
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