The browser for ambitious web devs.

A desktop browser with all the tools you need to build & test responsiveness, accessibility and SEO across screens.

Try for free 14 day trial. No credit card needed.

Polypane showing six different panes in one overview, emulating different devices and viewports

Polypane showing the same site in light mode, dark mode, forced color mode and reduced motion. The emulation settings are open showing additional options.

Polypane showing a single site with its landmarks highlighted as well as a focus trail rendered across the page. An opened sidebar shows the heading structure of the page.

Polypane with an opened sidebar showing the meta information of a page: title, description as wel as og tags and other meta data. The top of a social media card preview for Bluesky is visible.

Polypane showing three panes, with a sidebar containing the element inspector. The H1 element that's selected is highlighted in all panes. The sidebar shows the CSS properties and box model of the selected element.

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