In this presentation, Alexandre Quessy will present and demonstrate Toonloop, the live animation software. Participants will be able to try it with a camera and some lighting. He will explain why he created Toonloop, and how many people experimented with it for making movies, performances, installations as well as for teaching frame by frame animation. Stop motion can also be used for creating quick mockups of user interfaces. Toonloop is a free software frame by frame animation application. Creating an animation with Toonloop is very easy, since the current clip is constantly played back while being edited. This constant playback catches the attention of anyone looking at the computer display. Its user interface is quite streamlined, since most of the controls are currently keyboard-based.