Based on the idea that a tech-driven brokerage could operate with less overhead, Robinhood was among the first online brokerages to charge zero commissions for self-directed individual or joint stock trades. Following several years of reliable service, it's expanding into the hottest sector in finance: cryptocurrency. Soon, you will be able to buy Bitcoin and Ethereum in the same place as your shares, with support for other currencies on the way. Just like stocks, cryptocurrency trading will be available without a fee, with estimated prices and order "collars" keeping things stable during wild fluctuations in price. Available for iOS and Android, with a web-based app coming soon.