Simple and effective
Crypto Pro is an unassuming and uncomplicated Bitcoin ticker that doesnt annoy you with ads or in-app purchases, supports most iOS features such as 3D Touch (though excluding a Notification Center widget), and works exactly for the purpose of checking Bitcoin prices on the go. Similarly, the watch app is attractive and supports all of the watchOS features including Glances and Complications. Very few apps check these boxes. Im not sure what exchange(s) the prices come from, but the app itself works very well. Great job!
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Crypto Pro: Live Coin Tracker