Web app allows you to see instantly how any website looks on different type of screens. From large desktop, to notebook, tablet and smartphone you can see at-a-glance how your content is displayed on the four major kinds of popular devices.
My comment: A truly elegant and effective way to get a good idea of how any website looks across devices with the minimum fuss and effort. Recommended.
Try it out now: http://ami.responsivedesign.is/