Splitwise is the best way to share bills and IOUs and make sure that everyone gets paid back.

Use Splitwise to split household bills with roommates, to figure out costs for a group vacation, or just to remember when a friend spots you for lunch. On Android, iPhone, or the web (splitwise.com), you can view your balances, track spending trends, set up email reminders for bills, and much much more!

"I only wish such a tool had been available when I was a new college graduate..." – Ann Carrns, NYTimes Bucks Blog
"Splitwise removes all the friction from borrowing money between friends and roommates." - Melia Robinson, Business Insider
From version Splitwise 4.2.5:
★ Now with Indonesian language support!
✔️Improved photo upload experience; select your receipt / avatar photos from a wider array of apps.
✔️Split-by-shares updated to accept fractional amounts.
✔️Small stuff: Friends consistently referred to by first name + last initial, clearer error message for bills we can't sync, selecting a Paytm recipient no longer fails if the recipient has more than 1 phone number on file.
(Android 4.4+)
Latest: 4.2.5 on April 19, 2018
All versions
April 19, 2018
April 14, 2018
March 5, 2018
February 1, 2018
December 2, 2017
August 23, 2017