Polypane is the browser for web developers and designers. It shows your site in multiple viewports with everything synced between them. And when we say everything, we mean everything: scrolling, clicking, typing, hovering and even our unified developer tools edit content in all viewports at the same time, a unique feature and a massive time saver.
Polypane has all the tools you need to build responsive, accessible and performant sites five times faster. It's perfect for people that care about making great websites and web apps that are fast, accessible and responsive. With built-in accessibility checkers, simulators, overview of cookie info, meta info, live reloading and much more.
A desktop app for mac, windows and linux that shows you local and online websites in multiple viewports at the same time, with browser extensions for other browser to make it easy to use.