I wrote a todo list app for windows phone called listage, which had neat fast entry and auto categorising features. Free with in app purchase to unlock advanced

I wrote a todo list app for windows phone called listage, which had neat fast entry and auto categorising features. Free with in app purchase to unlock advanced features. I built it for myself but secretly hoped it would take the world by storm, which it did not. I sold 5 copies. That's probably 1/4 of all the windows phone users left out there :)