Debts Reminder is the app to have if you either are the generous type and like to give out cash, or if you have borrowed money from someone. Whichever the case, it helps you keep track of your monetary flow.
Its basic functionality consists of the fact that you can set up several reminders to when a certain amount of money is due to be paid or received. There is a built-in calendar which you can manipulate according to your needs, selecting the date of a reminder. The fact that you can also add an interest rate makes Debts Reminder highly useful.
Each time you must receive or pay a certain amount of money, as the due date approaches and the reminder is set, you get a notification.
There is also a built-in today widget which makes Debts Reminder extremely handy.
Debts Reminder is currently available both for the iPhone and the Apple Watch.

“A Lannister always pays his debts”― George R.R. Martin, A Game of Thrones.
Be sure to pay yours.