Viewport

Viewport is a dedicated browser to help designers and developers test and develop responsive websites. Viewport works with local or hosted sites and provides the following features - Ability to set multiple viewports with fixed dimensions or width ranges - Full page screenshots of all open breakpoints (great for portfolios) - Full webkit web inspector for easy debugging - Screen recording of breakpoints so you can demo your designs and show how layouts adapt - User testing mode on breakpoints with FaceTime camera support so you can record a users reaction and comments on your designs - Automatic breakpoint detection so you can see how existing sites are using media queries Viewport is retina ready and is optimised for Yosemite