RainCalc app for iPhone and iPad

A very simple calculator, which uses a slight variant on Reverse Polish Notation to do calculations. Press C to do your first calculation or to reset to zero.

C 3 + 6 x 8 - 9 / would do the equivalent of a normal calculator doing C + 3 = x 7 = - 8 = / 9 =. Its much simpler, faster, and generally more efficient to use. No long is the = button required!

At the moment only simple operations are included, although they will be expanded to make a more complete experience over time! Many new functions will be coming. This is an incremental calculator!

Quick explanation of functions:

×/÷ /+/− Hopefully you should know these! In order, multiply, divide, add, and subtract.

! - Factorial operation. Takes the number currently in display and outputs the factorial. A factorial is a number multiplied by all previous numbers. So, for example, 6! is 6 x 5 x 4 x 3 x 2 x 1.

√ - Square root. Takes the number currently in display and outputs the square root. So for example √ of 9 would be 3.

n2 - Square. Takes the number currently in display and outputs the square. So for example the n2 of 3 would be 9.

⊠ - Probably the one thatll have most users guessing, this outputs the nearest square number. So for example ⊠ of 13 would be 16. ⊠ of 23 would be 25, and so forth.