With Acorns, it really is easy to save your money. For one, you can deduct a set amount from your checking account on a monthly basis. But, the real genius behind Acorns is rounding up. So, when you use that debit card or checking account to buy something at the store, Acorns will round up the expense to the next higher dollar and then invest that difference for you. You’re always saving. And you don’t have to do a thing.