SomeSum app for iPhone and iPad

Calculator with undo / redo - undo operations and redo them. No more re-entering entire calculations after a mistake.

Dual main and memory displays. See both the main calculator value and the memory value. Both displays support copy and paste from/to the iOS clipboard - paste in values from other apps, and copy the results to use in other apps.

Multiple themes, including support for dark mode/light mode (iOS 13 onwards).

Ergonomic landscape mode - left-handed / right-handed layouts. Select the landscape layout most suited to your dominant hand, so that the keypad and often-used buttons are either on the left or right side of the screen.

Left-handed / right-handed landscape modes. Select the landscape layout most suited to your dominant hand, so that the keypad and often-used buttons are either on the left or right side of the screen.

Local regional decimal separator can be overridden in settings.

iPad version adds:-
- statistical functions
- hyperbolic, inverse trigonometric and inverse hyperbolic functions
- dice and random functions
- temperature conversion (Celsius, Fahrenheit, Kelvin)

In English
...und auf Deutsch!