The browser for developing responsive & accessible websites.

Dozens of tools that help you build responsive, accessible and fast websites. All in a powerful standalone browser, on all platforms.

Everything you need in one developer tool.

Powerful devtools, multiple synced viewports, full-height screenshots, over two dozen debug tools, device and media query emulation, built-in live-reloading and more.

Viewport Sizes

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


Over 80 accessibility tests, 14 different emulators and two dozen tools.

Side by side

Dark and light, reduced motion, screen and print. No more manual switching!

Great companies using Polypane.

Here's some of the features that Polypane comes with:

As many viewports as you need.

No need to manually resize and test websites screen-by-screen. Get all your viewports in one overview, no browser resizing needed.

Mobile screens, 5K monitors, all your CSS breakpoints or any size you want.

All in sync.

Scrolling, clicking, hovers, shortcuts and forms input are synced across all viewports.

Don't test viewports or devices one-by-one, check them all at once.

Edit all viewports.

The unified console and element inspector make it easy to edit your site in all viewports. Quickly see if your style or copy works on all screen sizes.

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

Fully featured with useful tools for making responsive & accessible websites.

Social media previews.

Pixel-perfect previews of social media sharing cards, for Twitter, Facebook, Slack, LinkedIn, Discord, Telegram and Google.

Live and hot reloading.

Built-in live reloading for anything from plain old HTML to Wordpress to React or Vue. No config or server needed.

Powerful developer tools.

Comes with Chromium devtools and support for extensions like React, Vue, Angular and Svelte.

Dark mode testing.

Test light and dark mode side-by-side in the same view. No need to change your entire operating system!


Click a single button to create a full-height screenshot of your page or an overview screenshot of all panes.

…And that's not all.

Polypane has everything you need to make awesome web experiences.

Unlimited Screens
Scroll Syncing
Hover syncing
Grid overlays
Unified console
Keyboard Syncing
Device Presets
Freeform Resizing
Horizontal Overflow detection
Developer tools
Pixel-perfect Social Media previews
Four layout modes
Device emulation
Handoff support
Live Reloading
Accessibility Audits
Page outlines
Live CSS Editing
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

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