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Acorns.com - Invest Spare Change Automatically with Round-ups
I use this great investing service/app called Acorns.com. Basically, you link your accounts and every purchase you make is rounded up to the nearest dollar. Those extra pennies are invested in an automatically managed stock portfolio, so you can gain wealth without thinking about it!
I also set automatic investments of a few dollars a week. It's an awesome investing app with no minimum to open an account, check it out!