Download this app if: you want to keep track of expenses on a group vacation.
I.O.Who? is a tabsplitter-type application. It helps you divide any expenses you've had evenly on every participant in a group, taking in to account what everyone already paid.
Imagine you are on a ski trip with your friends. On this vacation only you and a few of your friends end up paying for...
How much? — With this app, you can calculate how much everyone owes after a group vacation or trip.