Got most of what you possibly want
I tried several tip calculator apps, by far this is the one which I found have most features I want: The bill, tip, tax, split bill, and round up # for each. It shows you both the % and amount of each category (bill, tip, tax) in a clear and neat way. You can choose to key in the % or the absolute amount for the tip & tax, either way, it gives you the number of the other part. This app will be perfect if adding the possibility of choosing tip calculation before and after tax, and extra bill calculation function which is not for equally split, e.g. someone doesn't need to share the drink.
