Speecool is cool. It allows you to monitor your potential profit in cafe "Hops" average meals for 1 person while converting Belarusian rubles to other currency. The "Steak stake" is fixed to 500 BYN (version 1.0). Disposable rubles pool (virtual) equals to 2000 BYN. Exchange rates are updated every time you open the app, allowing you to watch your gain (or loss) real-time.
Programming — Alexey Orlov