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The browser for ambitious web developers.

A stand-alone browser with everything you need to build responsive, accessible and performant web sites and web apps.

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