Hesitation is a killer whenever you trade the stock market. Not only is Stash a trading and investment app , it is an app filled with articles and tips to help you level up your investment knowledge each time you access your account. But the best-integrated banking and stock trading app in one is the Schwab mobile app. We are committed to researching, testing, and recommending the best products. 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.