If you're struggling to lose weight, perhaps what you need is some motivation from, according to the developers, a “sadistic AI construct with one simple goal: to transform your flabby carcass into a Grade A specimen of the human race. She will do whatever it takes – including threatening, inspiring, ridiculing, and bribing you – to make this happen.” If you use the Carrot to-do app and it works great for you then this might just work. It features a weight tracker to monitor your progress, its own version of the popular 7-minute workout, fun rewards, reminders, and more.