Scientific Calculator.
Features:
- Math (arithmetic, trigonometric) calculations using parentheses, variables, constants;
- Unit conversions
- Solve an equations;
- Calculations in computer logic style (representation of numbers with a base 02-10-16, logical and bit operations; 8-16-32-64-bit integer);
- Saving variable;
- Save the calculation formulas in sets;
- The history of calculations;
- Calculation guides;
- Exchange calculation formulas (display text and/or calculation formulas);
- Custom keyboard layouts;
- Scroll through the keyboard and the display up and down;
- Customize the look (light, dark theme);
- Russian and English languages of interface;
- Vibro feedback on display taps.
Help and detail http://stele.su/abacus/help.htm

Bug fixes