WhatColor is described as 'Helps colorblind People identify colors on mouse-over' and is an app in the Photos & Graphics category. There are four alternatives to WhatColor for Windows, Google Chrome and iPhone. The best alternative is Vision, which is free. Other great apps like WhatColor are Color Binoculars (Free), Colorblind - Dalton (Free) and ColorAid (Free).
Color Binoculars is a Microsoft Garage to help color blind people. Using the iPhone camera, it adjusts colors, replacing difficult color combinations such as red and green, making it easier for color blind users to distinguish combinations.