POPAPP

POPAPP transforms sketches into click-through prototypes in minutes. Design wireframes on paper. Pen & paper are the best tools. Import your sketches by taking a picture. Create a storyboard by linking your sketches together with "link spots". Press play and simulate your user interface to make sure everything flows correctly. Share your prototype with colleagues and friends. They can try out your prototype in any device. You’d be surprised how valuable their feedback can be. POPAPP is widely adopted, its users include Yahoo, Zynga, LinkedIn and 37Signals.