<prompt> Human: I saw an ad for an app called acorns. It rounds up the change from purchases and invests them. Im really interested, it could be a great way to get a foot in the door of investing; but Im also apprehensive. Anyone have any opinions?  <response>: If you want to invest, just invest. Dont pay someone for it.Acorns is targeted at people who needwant expensive gimmicks. 