xCal - Use Excel as your calculator app for iPhone and iPad

xCal is designed for you to build calculators depending on your requirements. Customize parameters and formulas in an Excel spreadsheet in advance, import it into xCal and then you’ll own an exquisite calculator. With its simple and incredibly fun gestural interface, xCal is absolutely user-friendly and elegantly presented in a way wholly different from Excel or any other calculators.

You can use it to create a volume calculator, a restaurant tips calculator, a shopping payment calculator, a monthly installment calculator, a BMI (Body Mass Index) calculator and many other calculators of different uses.

No need to memorize long and complex formulas by rote, no need to enter the entire formula over and over again, and no longer fear that a slightest input error may mean starting over. What you need to do is just to input parameters’ values and results come out right away.

Features:

☆ Elegant & Intuitive User Interface
☆ Long press and drag an item upward or downward to create a new one.
☆ Long press and drag an item left or right to delete it.
☆ Easily and conveniently create, update and maintain formulas in Excel spreadsheets on your computer.
☆ Customize formulas and create as many parameters as you want.
☆ Provide build-in formula examples.
☆ Support part of (NOT ALL) operations and functions provided by Excel.
☆ Save calculation process including parameter values and results.
☆ Export all or part of saved calculation results into excel files.
☆ Support adding a logo to a formula.
☆ Support adding a note to a formula.

==========Operators and functions that xCal supports==========
● Unary Operators：
- addition (+), negation (-), percent (%)

● Binary Operators：
- addition (+), subtraction (-), multiplication (*)
- division (/), exponentiation (^), connects (&)

● Cell References
- relative cell references (e.g. B12)
- absolute cell references (e.g. $C$9)
- a range of adjacent cells (e.g. B5:D10)

● Functions
- Math functions
* SUM, ABS, MOD, SIGN
* POWER, EXP, LOG, LOG10, LN
* TRUNC, ROUND,
* RADIANS, DEGREES,
* PI, SQRT
- Trigonometry functions
* SIN, COS, TAN
* ASIN, ACOS, ATAN, ATAN2
- Statics functions
* COUNT, AVERAGE, MAX, MIN