PolypaneTry for free

Build sites that are responsive, accessible & fast.
82
× faster.

A standalone browser to guide your web development workflow every step of the way. Built-in tools for responsive design, accessibility, meta information and so much more.

Try Polypane for free 14 days free. No credit card needed.aria-label="Available for Windows, MacOS and Linux"
You're in great company

Amazing developers from these companies use Polypane.

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Why Polypane

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

Mobile screens to 5K monitors, get all viewports in one overview.

Accessibility

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!

Give it a try

Click, hover, scroll and type to see your actions happen in all panes.

https://localhost:1337
(imagine a menu here :)
Polypane syncs everything.
ScrollingScroll in one pane, scroll in all.
MouseClicks and hovers happen everywhere.
KeyboardOnly test your forms once.
Create as many panes as you needFind the overview that works for you. Store your favorite configurations in workspaces and share them with your team.
Resize panes whenever you want.Use our device presets, your own CSS breakpoints or freeform resize panes right on the main canvas.
Synced element inspector and consolePolypane has an element inspector and fully functional console that works across all panes, so you dont do double work.
Dozens and dozens of debug toolsLayout debugging, color blindness testers, build-in live reloading, screenshotting, device and media emulation...The list goes on.
Polypane has everything you need
to create amazing websites and webappsStart your free trial
(imagine a menu here :)
Polypane syncs everything.
ScrollingScroll in one pane, scroll in all.
MouseClicks and hovers happen everywhere.
KeyboardOnly test your forms once.
Create as many panes as you needFind the overview that works for you. Store your favorite configurations in workspaces and share them with your team.
Resize panes whenever you want.Use our device presets, your own CSS breakpoints or freeform resize panes right on the main canvas.
Synced element inspector and consolePolypane has an element inspector and fully functional console that works across all panes, so you dont do double work.
Dozens and dozens of debug toolsLayout debugging, color blindness testers, build-in live reloading, screenshotting, device and media emulation...The list goes on.
Polypane has everything you need
to create amazing websites and webappsStart your free trial
(imagine a menu here :)
Polypane syncs everything.
ScrollingScroll in one pane, scroll in all.
MouseClicks and hovers happen everywhere.
KeyboardOnly test your forms once.
Create as many panes as you needFind the overview that works for you. Store your favorite configurations in workspaces and share them with your team.
Resize panes whenever you want.Use our device presets, your own CSS breakpoints or freeform resize panes right on the main canvas.
Synced element inspector and consolePolypane has an element inspector and fully functional console that works across all panes, so you dont do double work.
Dozens and dozens of debug toolsLayout debugging, color blindness testers, build-in live reloading, screenshotting, device and media emulation...The list goes on.
Polypane has everything you need
to create amazing websites and webappsStart your free trial

Device sizes are not enough

You don't need a device wall, You need a screen size wall.

When you focus on devices you miss the hundreds of screen sizes your real users use. Don't believe us? Check your own data. With Polypane's devices, CSS Breakpoint panes and freeform sizing you can get the real full overview.

responsive design

All the viewports you need.

Don't 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.

Synced panes

And they're all in sync.

Scrolling, clicking, typing and even hovers are synced across all viewports.

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

Polypane helps with every aspect of web development.

Get the full overview of viewports, meta info, accessibility issues, web vitals and media features. Fix issues before your users find them.

Debug tools

From A11y to Z-index

Apply over two dozen debug tools to each viewport. Test your site in completely new ways.

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
Meta panel

Social media previews.

TwitterFacebookSlackLinkedinDiscordTelegram

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

Emulation

Dark mode media query testing.

No need to change your entire operating system! Test light and dark mode side-by-side in the same view. Also works for reduced motion, reduced data and even print styles.

Devtools

Your favorite DevTools extensions

Install and use your favorite Chromium devtools, with support for React DevTools, Vue.js DevTools, Redux DevTools, Angular, Svelte and many more.

zero configuration

Live and hot reloading.

Zero configuration live reloading built right into Polypane for anything from plain old HTML to Wordpress to React. Hot-reloading server not needed.

Images and CSS are updated without a page refresh.

Plays well with all your favorite frameworks

Devtools extensions for your favorite JS frameworks and easy ways to prototype with your favorite CSS frameworks. Keep your stack, be more productive.

  • React
  • Vue
  • Angular
  • Svelte
  • jQuery
  • Tailwind CSS
  • Bootstrap
  • Foundation
  • Bulma

…And that's just scratching the surface.

Polypane has everything you need to make awesome web experiences.

Unlimited Viewports
Scroll Syncing
Hover Syncing
Grid Overlays
Unified Console
Keyboard Syncing
Device Presets
Freeform Resizing
Horizontal Overflow Detection
Developer Tools
Pixel-perfect Social Media Previews
Different 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
Unified Element Inspector
Touch emulation
Devtools Extensions
Broken Link Checking
Custom Headers
Dark Mode
Workspaces
…and more added monthly!

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
Start free trialView pricing
Polypane screenshot
Kilian

Hi! 👋 I'm Kilian.

I'm the founder, developer, designer and support team at Polypane. Nice to meet you!

I built close to 200 websites in the past decade and I've always been building tools and libraries to improve my workflow. Polypane started as a prototype after getting frustrated that I had to resize my browser all the time. When I started using the prototype I was shocked: I instantly was 60% faster compared to just using Chrome.

And it's not just me. People keep telling me how much more efficient they are. 2 times, 3 times, some even 5 times as efficient!

That's why I'm building Polypane. My mission is to help devs and designers create the best web experiences they can, through a browser that puts them first.

- Kilian Valkhof