Currency Converter : Fast is a mobile and web application for converting over 150 world currencies. Its primary function is to provide exchange rate calculations that update automatically as the user types an amount. The application uses rates sourced from the European Central Bank and displays results to three decimal places for increased accuracy. It eliminates the need for a separate convert button, offering a direct conversion process. The typical workflow involves selecting a source currency and a target currency from the supported list, which ranges from the US Dollar to the Colombian Peso. As the user inputs a numerical value, the converted amount is displayed instantly. The application is available as a free download on the Apple App Store for iPhone and iPad, and a browser based version is also accessible for immediate use without installation. Currency Converter : Fast requires iOS 12.0 or later. The application processes data locally on the device where possible. It includes advertising through Google AdMob and utilizes anonymous analytics to improve the user experience. The developer states that personal data is not sold. The application provides links to its Terms of Use and Privacy Policy for user transparency.