Robo-advisor Wealthfront recently bumped the annual percentage rate (APY) on its high-yield savings account to 2.57%. The savings account is FDIC insured up to $1 million, fee-free, and requires a minimum opening deposit of just $1, making it accessible to all savers. We did the math to find out how a $1,000 initial investment, plus additional contributions of $100 a month, would grow at the current interest rate over five years. Currently, Business Insider readers who sign up for a Wealthfront investment account will receive their first $5,000 managed for free in that account in perpetuity.