https://itunes.apple.com/us/app/idea-sketch/id367246522?mt=8&ign-mpt=uo%3D8

Ideament lets you easily draw a diagram – mind map, concept map, or flow chart – and convert it to a text outline, and vice versa. You can use Ideament for anything, such as brainstorming new ideas, illustrating concepts, making lists and outlines, planning presentations, creating organizational charts, and more!