Email us your online broker specific question and we will respond within one business day. Robinhood launched its mobile app before its website, making this a best stock trading app in its own right. Still aren’t sure which broker to choose? You can also transfer funds to your account manually. By Eric Rosenberg. Placing regular stock trades and single-leg options trades is now a breeze, regardless of the broker used, and for brokers who offer complex options trading, it is mostly painless.