Coin Market Tracker is one of the most popular cryptocurrency apps. This rock solid app is a go-to for many people who use cryptocurrency. It shows you the up-to-date prices on most cryptocurrencies all around the world. It features a simplistic UI, but the simplicity works in the app's favor due to the amount of information it shows. Whether it is Bitcoins, Doge coins, or something more obscure, this app will probably have information on it. It's also totally free to use.