The calculation types are divided into the categories pocket calculator and converter. Your entries are recorded in a history, which is emptied every time the app is closed. You can also deactivate the deletion in the settings.
The following functions are available in the NT Calculator in the category calculator: Standard, Scientific, Radix, Loan, Time, Date. In the converter category there are: angle, range, data, energy, fuel, length, pressure, speed, temperature, time, volume, weight. In the settings you can also specify which of these views should be displayed when the app is started.