Tsubotan is an app that allows you to calculate your mortgage loan.Check the graph to see what effect prepayment has!We will be adding various features in future updates, so please look forward to it!Future implementation plans- Simple interest rate fluctuation setting function- Calculation function of monthly rate and APR (Annualized Yield) considering miscellaneous expenses etc.- Content comparison function- Calculate unit price per tsubo- Calculation function based on real estate investment