Codex Calc vs |RPN| Scientific Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Codex Calc
This app offers a powerful yet intuitive calculator experience with a variety of modes including scientific, unit conversion, and tip calculation. It features a customizable interface and a detailed history tape for all your calculations.
- Full scientific calculator functions
- Unit converter
- Tip calculator
- RPN mode
- History tape
- Customizable interface
- Multiple visual themes
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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.
|RPN| Scientific Calculator
This calculator app uses Reverse Polish Notation for powerful calculations. It offers customizable color schemes, layouts, and online help, designed for flexibility and usability. All features are unlocked with a one-time purchase.
- Reverse Polish Notation (RPN)
- Viewable stack
- Selectable portrait/landscape layouts
- Customizable color schemes
- Online visual help
- No ads or in-app purchases
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|RPN| Scientific Calculator is a calculator which features a variety of color schemes and layouts. It utilizes Reverse Polish Notation, a viewable stack, selectable portrait and landscape layouts, online visual help and many more. The application is meant to be as flexible and powerful as possible, without sacrificing usability. |RPN| does not have ads, and never will, nor does it use in-app purchases. All functionality comes with the purchase. Here is a youtube playlist with some helpful videos: https://www.youtube.com/playlist?list=PLucgGVHO2sKhnnNf1gapHS4Zy7u69VGAs
Screenshots
Verdict
The clearest difference is rating: Codex Calc at 4.0 against |RPN| Scientific Calculator's 2.3. Codex Calc also leads on review sentiment (100% vs 60%) and iOS requirement (12.0 vs 16). |RPN| Scientific Calculator's advantage is update cadence (fortnightly vs every 6 months) and ratings volume (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Codex Calc costs $0.99 and |RPN| Scientific Calculator $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Codex Calc holds the better App Store score, 4.0 against 2.3. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews point the same way: 100% of Codex Calc's written reviews are positive against 60% of |RPN| Scientific Calculator's.
Codex Calc ships an update every 6 months, |RPN| Scientific Calculator fortnightly. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.
| Parameter | Codex Calc | |RPN| Scientific Calculator |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 4.0 (1 ratings) — better | 2.3 (3 ratings) |
| Positive reviews | 100.0% of reviews — better | 60.0% of reviews |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 6 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 12.0 — better | 16 |
| Further details — not scored | ||
| Size | 11 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Driftwood Studio Software LLC | Bradley Smith |
Customer experience
Codex Calc
|RPN| Scientific Calculator
In-app purchases
Codex Calc
No in-app purchases
|RPN| Scientific Calculator
No in-app purchases
Questions
Is Codex Calc free?
Is |RPN| Scientific Calculator free?
Which has better reviews, Codex Calc or |RPN| Scientific Calculator?
Do Codex Calc or |RPN| Scientific Calculator have ads?
Which is updated more often, Codex Calc or |RPN| Scientific Calculator?
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