Great app but you should add this
You should add another way for splitting costs for example car renting.
Ok, now two people rent a car for 600 euros. Person 1 uses the car for two days, person 2 for one day. Now I enter the sum 600 to the app and give the person 1 factor 2 and the person 2 factor 1.
Person 1: 600/32 = 400 euros
Person 2: 600/31 = 200 euros
Ok, we can see it's not a fair split.
Now you should have a screen in the app for entering how many days the persons use the basis of the cost:
Person 1: Day one YES, day two YES
Person 2: Day one YES, day two NO
With this data we can calculate:
Total days: 2
Day one users: 2
Day two users: 1
Now we can calculate splits
Person 1, day 1: 600/2/2 = 150
Person 1, day 2: 600/2/1= 300
Person 2, day 1: 600/2/2 = 150
Person 2, day 2: no data = 0
Then we can sum the days
Person 1: 150+300 = 450 euros
Person 2: 150+0 = 150 euros
OK, now that's a fair split
I hope you can add this feature before summer 2015 :)
Why don't you just do that manually.
Please add more help and examples.