You can also log in to Apple, Android, and Kindle Fire devices to manage your investments, watch a live stream of CNBC, research, enter trades, and follow your portfolio performance. Upgrading to a premium Robinhood Gold account gives you access to margin trading and extended hours trading in addition to all other features. With 50 different variables being assessed for mobile trading alone, scoring high marks is no walk in the park. For families, Stockpile is great because it lets you buy and gift shares of stock. The best overall stock trading app experience comes from TD Ameritrade , one of the largest brokerage firms in the country. To trade, tap on or search for any stock.