Cash App is our favourite way to buy bitcoin in the United States. The user interface is super easy to use and less daunting than exchanges like Kraken or Bitstamp that are selling dozens of coins. Their commission is also low and millions of U.S. citizens already have the app on their phones so there is no additional setup. The only drawback with CashApp was that you could only buy bitcoin and withdraw. You could not deposit bitcoin and sell it for dollars. Thankfully they are now rolling out an update to all their customers that will allow them to deposit and sell BTC via the app.