What is CALX?

CALX is an RPN calculator — a calculator designed to work with a list of numbers.

This means that instead of just typing an equation into your calculator, you push numbers onto a stack, and then apply operations to the lowermost numbers in the stack.

It's bizarre, but it makes sense once it clicks.

How you use CALX is up to you.

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Gestural interaction

Manipulate your data with simple, intuitive gestures.

Multiple keypads

CALX features an array of basic, scientific, and statistical functions.

Interactive tutorial

If you’re unfamiliar with RPN, the built-in tutorial will get you up to speed in three minutes.


Select from different fonts and colours to find a combination that works for you.

Download CALX today!