Complex RPN Calculator

Complex RPN Calculator

Complex Numbers RPN Calculator

22 ratings
87 reviews
Free

Details

  • Released
  • Updated
  • September 27, 2008
  • September 18, 2025

Features

Complex RPN Calculator video #1 for iPhone
Complex RPN Calculator video #2 for iPhone
Complex RPN Calculator screenshot #3 for iPhone
Complex RPN Calculator screenshot #4 for iPhone
Complex RPN Calculator screenshot #5 for iPhone
Complex RPN Calculator screenshot #6 for iPhone
Complex RPN Calculator screenshot #7 for iPhone
Complex RPN Calculator screenshot #8 for iPhone
Complex RPN Calculator screenshot #9 for iPhone
Complex RPN Calculator screenshot #10 for iPhone
Complex RPN Calculator screenshot #11 for iPhone
Complex RPN Calculator screenshot #12 for iPhone
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About

This scientific calculator utilizes a four-level stack and natively handles complex numbers. It allows users to input and view numbers in both polar and rectangular formats, remembering its state and offering 10 memory locations.

Complex number support
Four-level stack
Polar and rectangular formats
State persistence
10 memory locations
Scientific calculations
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What users say

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What's New in Complex RPN Calculator

6.0

September 18, 2025

Fixed some bugs associated with setting the significant digits in FIX, SCI and ENG modes that were causing crashes Changed the way Pi modifies the stack to make it more intuitive. Added a mode to show the stack when in landscape mode. Be away that when you are entering a number, x will show as 0. If you are experiencing button lag or don't like not being able to play music in the background, change Click Style to none and this will fix your problems.

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User reviews

Great calculator with one odd interface issue

I use this calculator for complex number calcs all the time but there’s one gotcha for a new user. It’s not obvious how to enter a number in polar format. To do so use the angle key to get it into polar display mode and then the ‘i’ key is used to enter the angle.

Why does the app mute other apps?

When playing music or listening to a podcast, when you use the calculator it mutes the music. Why?
This must be fixed. I’m looking for another rpn calculator that doesn’t do this?

Fix it please

Good RPN

This app is great! I have been using this app for years as a clean and simple, RPN scientific calculator. I was surprised to see the recent update to SwiftUI. On one hand, the update adds some great functionality, like the ability to turn the click sound from the key press off, maculate how the numbers are displayed, and let's you see the stack. On the other hand, SwiftUI is just downright fugly. There's no other way to say it. It really stinks. That isn't this developer's fault, it's Apple's. What makes it ugly is that there's too much border, or white space, around the buttons. IT's true for every other app I've seen migrated to SwiftUI. They all get ugly and harder to use.
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Update to SwiftUI has slow entries

The calculator keyboard responds very slowly with this update. I can type 4-5 numbers before the first number appears.

Very annoying and difficult to see if one has made a mistake on entry until a few seconds later.

I am using an iPhone 14 Pro Max.

Cool little Calculator

Works well on MacOS

Developer apps

User experience

🐞

Reported Bugs

6 issues

Mutes other apps when used

Bug

Slow keyboard response after update

Bug

X^3 calculation incorrect for large imaginary numbers

Bug

App crashes on opening/button press (historical iOS 9 issues)

Bug

App starts upside down in landscape on iPad (historical iOS 8 issue)

Bug

Unreadable fonts on iPad (historical version 1.2 issue)

Bug

Requested Features

24 requests

Turn off key click sound

Feature

Customize number display

Feature

See the stack

Feature

Fix slow entry response

Feature

Fix imaginary number calculation (X^3)

Feature

Improve SwiftUI design (less whitespace)

Feature

Show all stack levels

Feature

Add angle function

Feature

Add magnitude function

Feature

Add 'Clear X' button

Feature

Make RAD/DEG toggle button

Feature

Single button for Sci/Eng/Fix/Raw modes

Feature

Add '//' (parallel) function

Feature

Add 'Module' button

Feature

Change 'i' to 'j' for imaginary part

Feature

Show stack levels

Feature

Add log2 function

Feature

Add logGamma function

Feature

Smaller buttons

Feature

Add complex conjugate button

Feature

Add real part button

Feature

Add imaginary part button

Feature

Add modulo function

Feature

Make app start faster

Feature

FAQ

What is Complex RPN Calculator?

Complex RPN Calculator is a scientific calculator designed for complex number operations. It uses a four-level stack and allows input and display of numbers in both polar and rectangular formats.

What are the key features of this calculator?

Key features include native support for complex numbers, a four-level stack, the ability to view and enter numbers in polar and rectangular formats, state persistence between uses, and 10 memory locations for storing values.

Is this app free to use?

Yes, the application is available for free. There are no in-app purchases or advertisements mentioned, indicating a completely free user experience.

Who would benefit from using Complex RPN Calculator?

This app is ideal for individuals involved in fields like engineering, science, and advanced mathematics who frequently work with complex numbers and prefer the efficiency of Reverse Polish Notation.