BreakpointTester BETA

A bookmarklet to visualize your app using the media query breakpoints that are actually in your CSS

 

Breakpoint Tester Is Bookmarklet Which Scans Website Stylsheets (Same Domain) To Find User Defined Media Query Breakpoints. It Let’s You Check Responsive Designs By Breakpoints Rather Than Fixed Device Widths.

Read more from the source: breakpointtester.com