https://itunes.apple.com/us/app/carrot-to-do-talking-task-list/id591840203 

Simply having a to-do list does not guarantee you’ll get anything done. In fact, most of our to-do lists start with “Make a To-Do List,” just so we can cross something off. With CARROT, your to-do list becomes a game, and you get more done because of it. Whether you accomplish your tasks and CARROT rewards you, or you upset it is totally up to you and your productivity.