Compatibility: macOS 10.7 or later, 64bit

Tired of launching the macOS Calculator app and stepping through menu paths or launching the fullscreen macOS Dashboard just for doing a simple currency conversion? 

Exchange Rates can also inform you automatically with a notification when a predefined threshold of a currency pair is de- or exceeded. This feature is available for all supported currencies (including various crypto currencies) and the 4 precious metals (either in grams or troy ounces).

Mac App Store: https://geo.itunes.apple.com/app/id718218603