Kangaroo is an app I created at a 24-hour hackathon in Brooklyn. I worked on it with two close friends of mine, and the idea is to simplify the process of buying items in a supermarket by managing your shopping cart items from your mobile phone.
The browse controller, from which the user can look through items that are featured by the supermarket.
The store selection controller, from which the user selects the store they are shopping at, for situations in which several supermarkets are in close vicinity of each other.
The cart, from where the user can look at the items in their starting cart and initiate the checkout process.