GraphIso is a simple graph symmetry and isomorphism tool for iOS. It lets you draw graphs of up to 20 vertices in a few easy strokes of your finger, then watch as their symmetries are animated on screen. You can also test two graphs for isomorphism, or put a graph into canonical form. The use of dynamic drawing and animation avoids the need to laboriously write out labels and makes GraphIso a great learning and teaching tool, as well as great fun to use.