Great! One UI suggestion.

Excellent program, BTW!

When it comes to name input, it would be good to be able to do it also when on the first screen when the number of people are being selected. Plus, rather than selecting behind the letter, back tapping it out, then typing in the three new letters, it would be better to tap the letter, have it automatically erase, then be able to put in a name from then on. Instead of a three letter limitation, room for a fuller name (perhaps popping up when touching the field when on other screens, to save visual space) would be nice.

Mark Tuh-deen about Billr: Bill Splitting at the Table