In today's world of credit cards, tight social schedules and on-the-run meetings, it's easy for your financials to get entangled. You buy a coffee for a friend, you split a meal, you pay your share of the rent, and so forth.
Promissory (US$1.99) is an iOS app that lets you keep track of what you owe and who owes you what. Instead of trying to hold onto receipts or scribble down how much dinner cost last night, you can enter amounts as they happen.
The person who picks up the tab links to the friends who offered to chip in, and the app keeps track of those values over time.
I remember one time when a friend's ATM card stopped working, so I covered her expenses over a weekend in New Orleans. I wro
