Using the commission-free stock trading app Robinhood, users can purchase & sell stocks, ETFs, options, and cryptocurrencies all without having to pay any fees. For novices interested itech appsn making cryptocurrency or stock market investments, Robinhood is a great option because of its user-friendly features and intuitive interface. 3. Ibotta: Ibotta is an app that gives cashback on purchases made at participating merchants. Customers only need to upload their receipts to start earning cash back on purchases of food, apparel, electronics, and other items.