Penny stocks are characterized by a low price, low liquidity, and wide spreads. If you want help learning how to trade penny stocks using their mobile app you can stop by one of their offices. Thinkorswim offers hour trading five days a week for eligible securities, which makes the trading experience a bit more exciting. E-Trade has a top-notch trading platform with web, desktop, and mobile versions available. Note that Robinhood does not support the Pink Sheets or over-the-counter stocks; it only ties into major exchanges. Our Penny Stock App does not recommend particular securities. Get started investing, and learn how to master the stock market!