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Hey fans, Polypane is the best way to develop amazing sites.

Polypane is the browser for developers with tools that help with literally every part of modern web development, helping you save hours (and frustration!) with every project.

Polypane is really saving my bacon while building the new Level Up Tutorials website. Kilian knocked it out of the park, this is my new favorite development tool.Scott Tolinski - host, Level Up Tutorials
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, get all viewports in one overview.


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

Side by side

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

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

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

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

Polypane has hundreds of tools:

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
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
Devtools Extensions
Broken Link Checking
Share links
Custom Headers
Dark Mode
…and more added monthly!

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. Wanna give it a try?

— Kilian Valkhof