I can see that there might be demand for this, although I would not recommend this app to my friends so that's a bad sign. I fear that casual people trade stocks for certain reasons - only one of which is to make money. In particular, I think a lot of people trade stocks because they have certain hypotheses about the world / markets and they want to test them out or be able to talk about them. Even people who invest in index funds have strong beliefs about which index funds are best. I guess you can tap into the "which managers are best", kind of, but it doesn't seem as appealing for some reason.