Lets you keep track of how much money spent, in an uncomplicated format. I suppose you could use it easily for monthly expenses, but I use it to keep track of all the apps I have bought. I have a folder called "APP PURCHASES" and then I have started to create lists, depending on category, to keep track of how much $ I have spent- it keeps a running total for you. You can also search by word, so if you want to see how much you have spent only on "AAC" apps, you can do that too. It is handy, and simple, to just write down something, add the amount, and it will calculate automatically... You can also send a CSV file of a folder to yourself or to a variety of other places, if desired...