Debt Reduction Tracker allows you to pay off single or multiple debts by letting you organize them very easily. You just have to feed in the details of your loan such as the loan amount, no of years to pay it off and rate of interest and it provides you with the monthly payment you ought to do. Whats more, the app even readjusts those monthly values, if you decide to pay more or less anytime in the middle of the duration.
At the end of each year it calculates your total payment and the interest you payed in that year.