Debt come in many forms and shapes — at one end are the big loans you take from the bank, and at the other end is the small change you owe your friends, roommates and co-workers. IOU — Debt Manager, available for iOS and Android, claims to be the debt manager for “things and money”, and help you keep track of myriad small debts you owe or are owed. You can set pay-off dates, decide on partial or full payments, keep historical records and sync this data to the cloud. The app can also dash off email reminders to your debtors. However, if you want to customise the messaging, you will have to pony up for the pro version, which also adds overdue notifications, password protection and exporting of data as a CSV file, among other features.