Create a simple application to keep track of the personal cash flows

Name of the app: MyBalaceSheet The app is conceived for mobile phones, thus it should work at least on android mobile phones. The idea is that of a registry to keep track of expenses and gains of the person. Each time the person receives money or spend it, he has to insert it on the app which will keep track of the cash flows. The person should also be given the possibility to insert a short description of the single cash flows. Each time the person access the app he should be able to see the total amount of money he spent and gained until that moment in that specific month and have the difference among the two values displayed. Then he should be given the possibility to see the details of the cash flows (amount of the single flows and the short descriptions). When a new month begins, we don't want the information about the prevoius months to be lost: if possible, we would like the app to keep memory of the flows of the past months. We want to have a functional app, so the design is not really important for us.