I'd recommend a combination of billguard and mint. Mainly billguard, both free. billguard allows you to add your debit/credit card accounts. when you make a purchase, bill guard notifies you. it will group your spending habits into different categories. at the end of every week, bill guard notifies you by email with a message similar to this "you have spent $400 this week etc. etc. going into the app itll show you where the money you spent went to. this is a great way to determine how much money you go through a weekly basis.