Watchlists and alerts synchronize across platforms, allowing you to run a custom screen on your mobile app and access the results of that screen on your desktop. In second place is Fidelity. With roots in Silicon Valley, this brokerage began offering online trades using the Internet via America Online and Compuserve. On the innovation front, TD Ameritrade was one of the first brokers to offer an Alexa Skill, and in August , it became the first broker to integrate with Facebook Messenger, embracing the future of artificial intelligence AI with its own chatbot. Investopedia is dedicated to providing investors with unbiased, comprehensive reviews and ratings of online brokers. We conducted all our tests on iOS devices, and focused primarily on the iPhone. Before trading options, please read Characteristics and Risks of Standardized Options.