Currency Converter - xCent. Exchange rates app is a powerful and straightforward app that allows users to convert over 175+ currencies offline and live. It is available on both Android and iPhone, and its simple interface makes it easy to use, even for those who are not tech-savvy. Users can select their base currency and see how much it is worth in all other world currencies. Additionally, there is no limit to the number of currencies that can be added to the watchlist. The app also displays country flags, making it more exciting and fun to use while traveling. This app is a must-have for travelers who want to convert currencies on the go, even without an internet connection. Currency Converter - xCent. Exchange rates app has been connecting the world through currency exchange by providing reliable exchange rates for free.