# Codex Calc vs |RPN| Scientific Calculator

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.

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.

## The numbers

| Metric | Codex Calc | |RPN| Scientific Calculator |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/codex-calc/id505057155/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/rpn-scientific-calculator/id1069467997/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | **100.0% of reviews** | 60.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Fortnightly** |
| Monetization | Paid | Paid |
| Size | 11 MB | 2 MB |
| Requires iOS | **12.0** | 16 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Driftwood Studio Software LLC](https://appshunter.io/developer/1822849713) | [Bradley Smith](https://appshunter.io/developer/1069467996) |

## What reviewers say

### Codex Calc

[App page](https://appshunter.io/ios/app/codex-calc/id505057155)

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.

**Highlights:** Full scientific calculator functions, Unit converter, Tip calculator, RPN mode, History tape, Customizable interface, Multiple visual themes

**Features:** macOS Compatibility

**In-app purchases:** none


### |RPN| Scientific Calculator

[App page](https://appshunter.io/ios/app/rpn-scientific-calculator/id1069467997)

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.

**Highlights:** Reverse Polish Notation (RPN), Viewable stack, Selectable portrait/landscape layouts, Customizable color schemes, Online visual help, No ads or in-app purchases

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Codex Calc free?

Codex Calc costs $0.99, with no in-app purchases.

### Is |RPN| Scientific Calculator free?

|RPN| Scientific Calculator costs $0.99, with no in-app purchases.

### Which has better reviews, Codex Calc or |RPN| Scientific Calculator?

Codex Calc is rated higher. Codex Calc averages 4.0 out of 5 from 1 ratings, while |RPN| Scientific Calculator averages 2.3 from 3 ratings.

### Do Codex Calc or |RPN| Scientific Calculator have ads?

Neither Codex Calc nor |RPN| Scientific Calculator shows ads.

### Which is updated more often, Codex Calc or |RPN| Scientific Calculator?

Codex Calc ships an update every 6 months, and |RPN| Scientific Calculator fortnightly. Most recently, Codex Calc was updated on October 6, 2026 and |RPN| Scientific Calculator on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*