As an international student in the US, I often need to check up on currency exchange rates which as you can imagine is not a very exciting process. This app lets me set an alarm so that I can be notified whenever the exchange rate of a currency is above or below a specified value. I can add currencies I want to monitor by name or by the name of the country that it belongs to. Also shows a historical trend of currency rate changes since the last update.
Overall really easy and intuitive user experience.