The Currency Converter is a professional, mobile-friendly web utility that fetches live exchange rates from exchangerate.host and converts amounts between any supported currencies. It includes a historical date option, precision control, swap/clear actions, and robust error handling. Rates are cached in localStorage so conversions continue to work offline or if the API is unavailable. The interface is accessible (ARIA-friendly), keyboard-ready, and designed for quick integration into static sites or as a starting point for more complex financial tools.