If you need a savings account to deposit the money you manage to save using the aforementioned apps, Chime is a good choice for you. Chime is an online bank which allows you to set up a savings as well as checking account completely free.
The best part is that whenever you make a purchase with the Chime debit card the app rounds it up to the next dollar. For example, spend $15.47 and it becomes $16. The app automatically deposits the change into your savings account. There are no annual fees, minimum balance requirements or transfer fees on a Chime account.