I wanted to create a simple app for a free loan service. We have people who deposit money by us and we lend it out interest free. We want a password protected app that will track how much money each person has/owes and a total of how much money we actually have. Features that we would like included is a history of each transaction on each person's individual portfolio, the ability to take a picture of a check (since often times people pay with checks), and the ability to sign transactions as proof of the transaction occurring. It needs to function completely offline and preferably with a backup option to USB.