Chess Clock XP is a handy app that turns your iPad into a feature-rich chess clock. It offers two working modes: the forward mode allows deeper thoughts with critical moves; and the countdown mode offers extra fun for timed game. In each mode, players can be rewarded with bonus seconds after each move, or, must take a move within limited thinking time. All settings are customizable for either player respectively. The app is intuitively easy to use for its neat, text-free and language independent user interface with optional sound prompt. So, it's suitable for any Earth citizen.