<prompt> Human: So I have been looking for an iPhone app that I can link to my bank account to take the spare change from small transactions and put it into an investment portfolio. So if I spend 6.30 at the store, Id like the app to round up to 7.00 and take that additional .70 and put it in a mutual fund or portfolio that I have control over. I am completely new to the world of investing, or even saving for that matter, so I am not entirely sure how I would like to go about this. But I do feel like this would be an easy piggy-bank style of saving that guarantees a steady return on investment. But handing over my banking information to an app I downloaded on the internet seems a little bit risky to me so I would like any input you guys would like to offer.Does anyone know of such an app, or a banking program that does this for me automatically and is secure? Thanks!  <response>: Although, I would recommend you just make a budget and dedicate some of your income to a low cost investment funds. You can do better than the fees collected by Acorns. 