Blisk is another responsive tool, but this one is a desktop app that you download and install to your computer. Basically it operates as its...

ResponsiveView Chrome Extension to quickly and easily see your website in different viewports. This seamless tool lets you quickly flip between devices.

http://ami.responsivedesign.is/ You type your URL here, and the page barely reloads. The image of the existing computers stay as-is, but you see your website appear...