# RPN Calculus vs Codex Calc

The clearest difference is device support: Codex Calc at 3 against RPN Calculus's 1. Codex Calc also leads on price ($0.99 vs $1.99). On rating, review sentiment, ratings volume and update cadence there is nothing between them.

RPN Calculus costs $1.99 and Codex Calc $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.0 for RPN Calculus against 4.0 for Codex Calc. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

RPN Calculus ships an update every 4 months, Codex Calc every 6 months. The most recent releases landed on October 14, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | RPN Calculus | Codex Calc |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/rpn-calculus/id374359458/reviews) | [4.0 (1 ratings)](https://appshunter.io/ios/app/codex-calc/id505057155/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 6 months |
| Monetization | Paid | Paid |
| Size | 11 MB | 11 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Braun](https://appshunter.io/developer/296553965) | [Driftwood Studio Software LLC](https://appshunter.io/developer/1822849713) |

## What reviewers say

### RPN Calculus

[App page](https://appshunter.io/ios/app/rpn-calculus/id374359458)

This scientific calculator app for iPad offers a clean RPN interface with basic and advanced functions. It supports high precision calculations and provides an extensive, user-extendable database of scientific constants.

**Highlights:** RPN (Reverse Polish Notation) interface, Basic and advanced mathematical functions, High precision calculations (up to 15 digits), Extensive scientific constant database, User-extendable constant database, Memory space for values

**In-app purchases:** none


### 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


## Frequently asked questions

### Is RPN Calculus free?

RPN Calculus costs $1.99, with no in-app purchases.

### Is Codex Calc free?

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

### Which has better reviews, RPN Calculus or Codex Calc?

RPN Calculus and Codex Calc are both rated 4.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do RPN Calculus or Codex Calc have ads?

Neither RPN Calculus nor Codex Calc shows ads.

### Which is updated more often, RPN Calculus or Codex Calc?

RPN Calculus ships an update every 4 months, and Codex Calc every 6 months. Most recently, RPN Calculus was updated on October 14, 2026 and Codex Calc on October 6, 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.*