Polypane is described as 'Browser built from the ground up to create websites and apps. Polypane the only browser that lets you develop a website for all viewports and devices at once, and gives you the best overview of them' and is a Web Debugger in the development category. There are more than 10 alternatives to Polypane for a variety of platforms, including Windows, Web-based, Mac, Linux and Google Chrome apps. The best Polypane alternative is BrowserStack. It's not free, so if you're looking for a free alternative, you could try Responsively or TestMu AI . Other great apps like Polypane are MultiGlancer, Browserling, LT Browser and Sizzy.
Browshot is a powerful service to take real-time screenshots in 30+ screen resolutions on 15+ virtual devices, including iPhone, Nook, Android, etc. Browshot provides full support for HTML5, CSS3, Flash, JavaScript, etc. You can request thumbnails of any size and any ratio.
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