That sounds like a great idea and I've been looking for something similar to try and lose weight. But if you eat out a lot and the calorie count is not written on the menue, how are you going to record it? For example, if you order chicken with rice, that may be a fairly healthy choice except if there's to much cream and butter in the sauce.
Eating healthy definitely is hard. Also can you link to the app? My google-fu is failing me.