# RPN vs Plus42

The clearest difference is rating: Plus42 at 4.9 against RPN's 4.3. Plus42 also leads on update cadence (weekly vs every 2 months) and review sentiment (92% vs 80%). RPN's advantage is price ($2.99 vs $9.99) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

RPN costs $2.99 and Plus42 $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Plus42 holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Plus42 has 79 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 80% of RPN's written reviews are positive against 92% of Plus42's.

RPN ships an update every 2 months, Plus42 weekly. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | RPN | Plus42 |
| --- | --- | --- |
| Price | **$2.99** | $9.99 |
| Rating | [4.3 (10 ratings)](https://appshunter.io/ios/app/rpn-25-ce/id1529311398/reviews) | **[4.9 (79 ratings)](https://appshunter.io/ios/app/plus42/id1597963622/reviews)** |
| Number of ratings | 10 | **79** |
| Positive reviews | 80.0% of reviews | **92.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Paid | **Free** |
| Best chart rank | — | **#106** |
| Size | 28 MB | 11 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [Thomas Okken](https://appshunter.io/developer/337692632) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-25-ce/id1529311398)

This app is a photo-realistic simulation of the classic HP-25 scientific calculator. It offers advanced programming features, a vast function library, and modern enhancements for enhanced usability on iOS devices.

**Highlights:** Photo-realistic simulation, Programmable (99/999 steps), 15 user-defined function keys, 100 symbolic labels, 100 visible registers, Program library with 150+ programs, Over 270 functions

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Plus42

[App page](https://appshunter.io/ios/app/plus42/id1597963622)

**Currently charting:** #106 Top Paid · Utilities (US App Store)

This advanced scientific calculator simulates the classic HP-42S RPN calculator with enhanced features. It offers algebraic expressions, unit conversions, directories for storage, a larger resizable display, financial functions, and 2D plotting with integral and root finding.

**Highlights:** HP-42S RPN calculator simulation, Algebraic expressions, Attached units and conversions, Program and variable directories, Resizable 8-row, 22-column display, Time value of money and amortization, 2D function plotting with zoom and pan

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is RPN free?

RPN costs $2.99, with no in-app purchases.

### Is Plus42 free?

Plus42 costs $9.99, with no in-app purchases.

### Which has better reviews, RPN or Plus42?

Plus42 is rated higher. RPN averages 4.3 out of 5 from 10 ratings, while Plus42 averages 4.9 from 79 ratings.

### Do RPN or Plus42 have ads?

Neither RPN nor Plus42 shows ads.

### Which is updated more often, RPN or Plus42?

RPN ships an update every 2 months, and Plus42 weekly. Most recently, RPN was updated on October 24, 2026 and Plus42 on October 27, 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.*