Fees vary depending on platform, but typically you're looking at fees around 0.2 to 0.25% of your balance annually. Some platforms don't charge fees based on your balance and instead charge monthly subscription fees. Ellevest takes this approach, with its basic plan costing just $1 a month.  A robo-advisor is a great way to get into investing without much money or time. If you know investing is important but don't want to put in a lot of work (or cash), a robo-advisor might work for you.