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Polypane

Changelog

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The browser for ambitious web developers.

Build better websites in less time with a stand-alone browser that makes your site more responsive, more accessible and faster. Save hours on each project, love every minute of it.

You're in great company

Talented developers from these companies use Polypane.

Circle
For ambitious web developers and designers

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.

Responsive design

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

Accessibility

Over 80 accessibility tests, 19 different simulators and 20+ debug tools.

Side by side views

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

Give it a try

Click, hover, scroll, focus and type. Your actions happen across 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 wantUse our device presets, your own CSS breakpoints or freeform resize panes right on the main canvas.
Synced element inspector and consolePolypane features an element inspector and a fully functional console that works seamlessly across all panes, eliminating duplicate tasks.
Dozens and dozens of debug toolsLayout debugging, color blindness testers, built-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 wantUse our device presets, your own CSS breakpoints or freeform resize panes right on the main canvas.
Synced element inspector and consolePolypane features an element inspector and a fully functional console that works seamlessly across all panes, eliminating duplicate tasks.
Dozens and dozens of debug toolsLayout debugging, color blindness testers, built-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 wantUse our device presets, your own CSS breakpoints or freeform resize panes right on the main canvas.
Synced element inspector and consolePolypane features an element inspector and a fully functional console that works seamlessly across all panes, eliminating duplicate tasks.
Dozens and dozens of debug toolsLayout debugging, color blindness testers, built-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 need a viewport size wall.

Testing on just your own devices is not enough. With Polypane's powerful overview - including globally used devices, CSS breakpoints, and freeform sizing - you'll see all the viewports your users actually use in one overview. Put your actual user data to the test and experience the overview that only Polypane gives.

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.

All-in-one

Polypane helps with every aspect of web development.

Viewports, meta info, accessibility, performance, web vitals and media features, all easily testable. Fix issues before your users find them.

Debug tools

From A11y to Z-index.

Apply over 40 different debug tools to each viewport. Test your site in completely new ways.

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.

User testimonials

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

I've started playing around with Polypane and 🤯. It has awesome debugging tools, accessibility checks and tests, and more. I'm really impressed.

Kevin Powell CSS Evangelist
Emulation

Dark mode media feature 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.

…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
JSON Viewer
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
Custom Sessions
Page Outlines
Live CSS Editing
Color Blindness Simulators
Full Page Screenshots
Visual Design Diffing
Meta Data Overview
CSS Breakpoint Detection
Overview Screenshots
Unified Element Inspector
Touch Emulation
Automated Form Testing
Screenshot Editor
Web Vitals Inspector
Color Picker
Browser Extensions
Broken Link Checking
Share Links
Custom Headers
Dark Mode
Workspaces
…and more added monthly!

Full product tour

Build your next project with Polypane

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

Frequently Asked Questions

Kilian

Hi! 👋 I'm Kilian.

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

I've built close to 200 websites over the past decade, while continuously creating tools and libraries to improve my workflow. Polypane started as a prototype after getting frustrated that I always had to resize my browser. When I started using the prototype, I was shocked. I was instantly 60% faster compared to just using Chrome.

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

That's why I continue to develop Polypane. My mission is to help devs and designers create the best web experiences they can, through a browser that puts them first. Wanna give it a try?

— Kilian Valkhof