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 4.3.6:
✔️Sync improvements, to better support devices and operating systems with strict background limits.
Variant
Arch
Version
DPI
(Android 4.4+)
Latest: 4.3.6 on October 18, 2018
All versions
October 18, 2018
September 14, 2018
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February 1, 2018