Robinhood uses cutting-edge security measures to help protect investor assets and personal information. App Store Preview. You can invest in a portion of a share instead with a much lower minimum investment. Thanks for bringing this to our attention, and keep up the feedback! Learn more about our review process. I will be seeking recoupment legally as this is not a sound business model. TD Ameritrade Mobile Trader is better for advanced and active investors, as it is loaded with charts, technical indicators and analysis to help you make trade decisions and enter on the go.