Making money out of money: not simple. Here are three painless mobile investing apps that make the process enjoyable.

1. ACORNS: SPARE CHANGE INVESTING

Set up Acorns with a bank account or a credit card, and it’ll skim the spare change off your transactions by rounding to the nearest dollar, then invest that change into a diverse portfolio with a risk level of your choosing. Taking money out, or putting more money in, is as easy as a swipe. Even easier: watching your spare change grow in real time. It’s the smartest piggy bank you’ve never had. 

2. KAPITALL: THE MONEY GAME

Are you the kind of person who wants a little carefree fun in even the most businesslike of tasks? While it has the brains of eTrade or AmeriTrade, Kapitall has the personality of a video arcade: Participating in its social communities and playing games earns you Koins, which you can spend on free trades. Best of all? Kapitall will allow you to set up a practice portfolio of $100,000 to see how you’d perform on the market, at zero actual risk or cost.

3. ROBINHOOD: NO FUSS, NO MUSS, NO FEE

Enter a stock symbol. Click on the stock symbol. Buy shares of the stock. It’s that simple. But Robinhood’s most revolutionary feature? Zero fees. It’s hard to believe, but true: Unlike virtually every other investing tool out there, Robinhood won’t charge you a dime to invest using their app. They make money by collecting interest from uninvested user balances (at no expense to the user). Like the app itself, the idea is as simple as it is groundbreaking.