Viewport at Mac App Store analyse

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