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The browser for ambitious web devs.

A desktop browser with all the tools you need to build responsive, accessible and performant sites.

Try for free No credit card needed.Available for Windows, macOS and Linux

All the tools you need to Build, Debug and Test sites

Develop and test every aspect of your site without context switching. From responsive design, to accessibility, to meta tags and performance, Polypane has you covered.

Responsive design

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

Lint as you go

Check your structure, metadata and accessibility. Get instant suggestions.

Side by side views

Test dark and light and more without changing your system settings.

This thing is FAST and the synchronized scrolling works amazingly. Prepare to be impressed.
Vivian Guillen - Frontend Dev, Curator at Tailwind Weekly
Polypane is really saving my bacon. Kilian knocked it out of the park, this is my new favorite development tool.
Scott Tolinski - Syntax.fm host, Level Up Tutorials
Polypane helped me see a spacing issue between two breakpoints that I wasn’t aware of. Love it 💯
Sara Soueidan - Front-end UI engineer, Speaker/Trainer
I've started playing around with Polypane and 🤯. It has awesome debugging tools, I'm really impressed.
Kevin Powell - CSS Evangelist

Everything you do is kept in sync

No matter how many devices you're working with, your actions are mirrored across all of them. Click, scroll, type, hover or edit styles on one and see it happen on all.

Navigation
Reloads
Scroll
Clicks
Hover
Form input
Inspect
DOM Edits
Layout Debugging
CSS Edits
Live Reload

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
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All-in-one

Polypane helps with every aspect of web development.

Develop and test your site in all the ways your real users view it: different screen sizes, device capabilities, color schemes, accessibility settings and more.

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.

Cross-browser and Cross-device

Even across browsers.

Share your local development environment anywhere, on any browser, on any device.

Polypane Portal keeps everything in sync whether that's the scroll position, interactions, style edits or layout debugging.

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 share card previews.

X / TwitterFacebookSlackLinkedinDiscordGoogleTelegramBlueskyMastodonThreads

Pixel-perfect previews of social media cards for X/Twitter, Facebook, Slack, LinkedIn, Discord, Telegram, Bluesky, Threads and Google Search. In dark and light mode. Even with your localhost.

Deep dive into our social media previews

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 really saving my bacon. Kilian knocked it out of the park, this is my new favorite development tool.

Scott Tolinski Syntax.fm host, Level Up Tutorials

If you’re designing modern applications and websites, you should try Polypane! It’s worth every penny!

Segun "Sage" Adebayo Creator of Chakra UI and Zag.js

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

Read more testimonials Join our Slack community

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

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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 only 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

This is how using it feels

Click, hover, scroll, focus and type. Your actions happen across all panes.

https://localhost:1337
Polypane syncs everything
Scroll
Hover
Click
Type
Try it:
Build, Debug and Test
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 consoleAn 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.
Everything you need to create amazing sites and webappsStart your free trial
Polypane syncs everything
Scroll
Hover
Click
Type
Try it:
Build, Debug and Test
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 consoleAn 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.
Everything you need to create amazing sites and webappsStart your free trial
Polypane syncs everything
Scroll
Hover
Click
Type
Try it:
Build, Debug and Test
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 consoleAn 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.
Everything you need to create amazing sites and webappsStart your free trial

Frequently Asked Questions

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 develop Polypane. To help devs and designers create the best web experiences they can, through a browser that puts them first. Give it a try!

By the way, Polypane is 100% bootstrapped. It's funded by users, so the only people I have to answer to are you.

— Kilian Valkhof