# Codex Calc

> Intuitive and powerful calculator with unit conversion and RPN mode. (iPhone/iPad app by Driftwood Studio Software LLC.)

- Source: https://appshunter.io/ios/app/codex-calc/id505057155 (this page in markdown: same URL + `.md`)
- Developer: [Driftwood Studio Software LLC](https://appshunter.io/developer/1822849713)
- Category: Utilities, Education
- Price: $0.99
- Rating: 4.00/5 from 1 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 11 MB
- Languages: American English
- Released: 2012-03-01
- Data updated: 2026-06-05
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/codex-calc/id505057155/reviews.md

## What is Codex Calc?

Codex Calc is the calculator for the rest of us: easy and intuitive, without sacrificing power and capabilities.

Calculator • Unit Converter • Tip Calculator • RPN Mode • Full Scientific • History Tape

All the power you need, wrapped in a beautifully designed interface that's simple without being simplistic.


ADAPTS TO YOU

Do you like big buttons, or small? Like minimalist interfaces, or are you a fan of bright and flashy? Prefer small fonts to see more detail, or big text and easy to read buttons? Codex Calc adapts itself to the way *you* like to work.


FEATURES

Everything you'd expect, plus:
• History tape records all entries and calculations
• Full suite of standard and scientific calculator functions
• Unit conversion mode for forward and reverse conversions
• Full tip calculator mode - taxes, tip, per-person amounts
• RPN mode fully integrated
• Rotation lock and sound on/off toggles
• Seven different professionally designed visual themes
• Multi-number memory and full set of memory-store operators
• Full control over history tape font size
• Single and multiple-line history tape formats
• Large and small button sizes
• Settings for customization (number formatting, behavior of clear key, display of calculation details, much more) 

Calculations:
• Trig functions in degrees and radians
• Log and power/exponentials
• Scientific notation / exponent mode
• Rounding and truncating
• Random number generation
• Parenthesis and sub-expressions
...and more!


INTUITIVE TOUCH INTERFACE

Take full advantage of your device's capabilities:

• Overlays - rather than making buttons smaller to fit more, Codex Calc uses intuitive overlays on the existing buttons.

• Popup Menus - hidden until you need them, pop-up context menus give you more power when the default action isn't quite what you need. 

• Zoomable History Tape - Tap the history tape to expand for more detail, change the font size, copy contents to clipboard, or forward as an email. View as single-lines to save space, or use multi-line view for more detail.

• Multiple Flexible Layouts - Portrait and landscape, large and small buttons, and seven different graphical themes. 

• Easy-Touch Everything - Codex Calc's entire design approach revolves around "touch to activate." Tap the tape to see it bigger, swipe to scroll, long-press a button for more options, tap the display to copy or paste, etc.

## Key features

- Full scientific calculator functions
- Unit converter
- Tip calculator
- RPN mode
- History tape
- Customizable interface
- Multiple visual themes

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/codex-calc/id505057155/reviews.md

### 4/5 — Nice but needs work

*2012-08-04*

Lots of features, some could use improvement. Easy to use as a basic calculator that shows previous entries. Not so easy to use entries from this. The addition and division keys have nearly identical symbols, an easy fix that would make it a good choice for occasional use.

### 5/5 — Good calculator with fun features

*2012-03-05*

Definitely worth the money!  I like this better than the standard IPhone calculator.  This is much easier to use & it's fun being able to change colors & key sizes as I want to.  Also seems to have more advanced features that tech people would use.

## Frequently asked questions about Codex Calc

### What is Codex Calc?

Codex Calc is a calculator app designed to be both powerful and easy to use. It includes a full scientific calculator, unit converter, tip calculator, and RPN mode, all within a customizable interface.

### What are the main features of Codex Calc?

Key features include a history tape that records all entries, a full suite of scientific functions, unit conversion for various units, a dedicated tip calculator, and integrated RPN mode. It also offers customizable themes and button sizes.

### Can I customize the look of Codex Calc?

Yes, Codex Calc offers extensive customization. You can choose from seven different visual themes, adjust button sizes (large or small), and control font sizes for the history tape. The interface adapts to your preferences.

### Does Codex Calc support RPN mode?

Yes, Codex Calc fully integrates Reverse Polish Notation (RPN) mode, providing an alternative calculation method for users who prefer it. This mode is available alongside standard arithmetic operations.

### How does Codex Calc handle calculation history?

The app features a zoomable history tape that records all entries and calculations. You can tap to expand it for more detail, copy its contents, forward it via email, and choose between single-line or multi-line formats.

### What devices is Codex Calc available on?

Codex Calc is available for iPhone, iPad, and iPod touch devices. It is designed to take full advantage of your device's touch capabilities.

### How often is Codex Calc updated?

The latest version, 1.5.1, was released on December 9, 2024. The app was originally released on March 1, 2012, indicating a history of ongoing development and updates.

### What is the price of Codex Calc?

Codex Calc is a paid application, available for $0.99. There are no in-app purchases or advertisements mentioned for this app.

## Version history (last 5 releases)

### 1.5.1 — 2024-12-09

Compatibility updates for recent iOS releases

### 1.5.0 — 2021-10-02

Updates for screen sizes of all iPhones/iPads

### 1.4.0 — 2016-10-01

Update for all modern screen sizes and iOS 10.

### 1.3.0 — 2013-04-02

Fix issue with starting in landscape layout, add About screen with version information.

### 1.2.0 — 2012-11-05

iOS 6 and iPhone 5 support.

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## More apps by Driftwood Studio Software LLC

- [Progress Today](https://appshunter.io/ios/app/progress-today/id606297836)
- [Chroniton](https://appshunter.io/ios/app/chroniton/id1572325897)

All apps by Driftwood Studio Software LLC: https://appshunter.io/developer/1822849713

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*