About Polypane
Polypane is a browser built for web developers. It shows several screen sizes and user settings side by side, so you can see how a site behaves on every viewport while you build it.
What it does
Polypane places every breakpoint in one view and keeps them in sync as you change the page. You can simulate user preferences such as dark mode, check accessibility as you work and preview how links look when shared. The browser also includes an elements panel, a network panel and free online tools, such as a colour contrast checker and a CSS specificity calculator.
Key features
- Every screen size shown and synced in one view
- Simulate user preferences such as dark mode
- Accessibility checks while you build
- Social media link previews before you ship
Who it's for
Polypane suits front-end developers, designers and QA testers who check many screen sizes. It is also useful for marketers who need to see how their pages and link previews will look before they publish.
Pricing and good to know
The site offers a free 14-day trial with no credit card needed, and paid plans are listed on the pricing page. The browser is a development tool, so you will still test your site in other browsers. Some newer panels and features may change between releases, and the changelog on the site lists recent updates.
Highlights
- See every screen size in sync in one view
- Simulate dark mode and other user preferences
- Run accessibility checks while you build
- Preview social media link previews before you ship
