The robo-advisor style app invests exclusively in ETFs to build you a diverse, broad portfolio in line with your investment goals. Best Free: Robinhood. E-Trade was once a pioneer in online investing. Best for Banking: Charles Schwab. E-Trade is also the owner of OptionsHouse, which has its own powerful app for active traders of stock and options. Description Best Brokers is a realtime stock market game focusing on fun.