If you find yourself constantly using Google to perform currency conversions, the xCurrency app might be just the thing you're looking for.
xCurrency features a minimalist design and a simple user interface. The app has support for swipe and long press gestures to perform a wide array of tasks such as replacing currencies, deleting records, tracking conversion history, etc.
Moreover, you can track conversion rate history of a currency within the past 3 years by just swiping left on a currency card, and get updates about the current exchange rate of cryptocurrencies such as Bitcoin and Ethereum with a right swipe.
The app gets real-time updates for global exchange rates of 210 currencies and automatically detects the local currency based on your location.