Digit is a savings app that reviews how much money you have in your checking account and automatically sets aside an amount you can afford to save.

Digit automatically changes how much it pulls from your account depending on what you have.

Penny Hoarder contributer Susan Shain was looking for a way to help her build a emergency fund. In just under a year, she saved $1,774.88 using the app.

"I couldn't be happier with my Digit experience so far," Shain says. "I mean, how could I not be? I have nearly two grand in my account."