Investing can be intimidating, but despite all the hype, new and innovative ways to save and grow your money are hitting the app stores with surprising speed. Whether you want to play the cryptocurrency market or invest some spare change for the long term, here are five innovative alternative finance apps that we love. Acorns is so simple, you’ll wonder why it’s not standard. Just sign up for the service, link your cards to it, and every time you buy something, the service rounds up your purchases. So, if you buy something for $1.50, it rounds it up to $2 and invests the two quarters for you in a mutual fund. It’s dead easy, especially if you use your cards for everything, and as the app says, every mighty oak starts with an acorn.The one downside? Make sure you’re on top of your credit cards, because those extra pennies total up fast on your bill, too. Stash is a similarly painless investing app that lets you start with $5 and pick from a host of exchange-traded funds, or ETFs, essent…