Once logged into the app for iOS or Android, you can view your investments or enter trades for stocks, ETFs, mutual funds and options including, some more complex option trades. Follow along for reviews of the best stock trading apps and may the market forever be in your favor. For families, Stockpile is great because it lets you buy and gift shares of stock. Just like anything else in the trading world, there is, unfortunately, no perfect investment strategy that will guarantee success. While this may make the program look very profitable in the past, optimization often leads to poor performance in the future. The user will still face psychological pressures, such as wanting to intervene when the program is going well protect profits or doing poorly protect capital.