Learn more about how we test. 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. These advanced tools include a performance risk tool which lets you figure out what will happen to your portfolio based on movement in an individual stock or options trade, or for your entire portfolio. The world of mobile trading continues to evolve rapidly. Supporting documentation for any claims, if applicable, will be furnished upon request. E-Trade is also the owner of OptionsHouse, which has its own powerful app for active traders of stock and options.