Chronometer and Countdown HD vs ZCalcIt

"Chronometer and Countdown HD" turns your iPad into a multi-stopwatch / multi-countdown timer. Useful in sporting competitions or during athletic training to measure athletic performance, in motor racing and wherever it is necessary to use one or more stopwatches / countdown (simultaneously). Features: - 4 independent chronometer (You can use them simultaneously together with the 4 countdowns) - Interruption and resumption of the stopwatches counting (independently one from another) - "Lap" for measuring the arrival of two subsequent events for each chronometer (total of 8 events simultaneously) - 4 countdown (independent and simultaneously) with remaining time adjustable (using the numeric keypad of the device) - synchronization buttons for all stopwatches and for all countdowns - chronometers and countdowns active even when the application is in the background

• Basic add, subtraction, multiply, divide, and power calculations. • Create variables to reuse in calculations. • Library of basic functions: sine, cosine, tangent, and more. • Units: Unit conversion (i.e., linear, time, temperature) functions. • Organized a set of calculations into projects for future references. • Documentation: Complete built-in documentation of all functions with numerous examples to get you started quickly.