Calc 256 app for iPhone and iPad

This calculator is intended for everyday use by programmers, engineers, and anyone else who prefers to do arithmetic by entering flat linear text expressions- in a similar manner to programming languages, or tools such as "bc".

The interface is entirely non-modal, there are no settings, and it makes no attempt to reformat, autocomplete, or otherwise second-guess your input.

Four independent tabs are available, labelled A to D.
The input to Tab B can refer to the output of tab A, using the "a" button.
Tab C can refer to A or B, and D to A/B/C.
(You cant refer to later tabs from earlier ones, because who wants to deal with circular reference resolution in their calculator? Not me!)

The buttons you see in the screenshots represent all available features, so its unlikely to be suitable for students or anyone else who needs trig and calculus functionality.
Please check that it meets your everyday needs before you buy.

Works on all screen sizes and orientations, and supports Dark Mode nicely.

Uses ExprTk by Arash Partow, under the MIT License.