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Calx: Stack calculator

By Daniel Clelland

This app is only available on the App Store for iOS devices.


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.

If this all sounds confusing, don't worry! CALX comes with a guided tutorial which will get you up to speed in three minutes.


• Gestural interaction: Manipulate your data with simple, intuitive gestures.
• Multiple keypads: CALX features an array of basic, scientific, and statistical functions.
• Customization: Select from different fonts and colours to find a combination that works for you.

What's New in Version 1.1

- iOS 9 font support

iPhone Screenshots

iPhone Screenshot 1
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Customer Reviews

Absolutely perfect

Takes a scary concept and makes it beautiful and simple. The only calculator I'll ever need. Wonderful job!

Calx: Stack calculator
View in iTunes
  • $0.99
  • Category: Utilities
  • Updated:
  • Version: 1.1
  • Size: 2.6 MB
  • Languages: English, French, German, Japanese, Simplified Chinese, Spanish
  • Seller:

Compatibility: Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.

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