# Plus42 vs RLM

The clearest difference is price: RLM at Free against Plus42's $9.99. Plus42's advantage is rating (4.9 vs 3.1) and in-app purchases (none vs 4). On ads and device support there is nothing between them.

RLM is free to download; Plus42 costs $9.99 up front. RLM sells 4 in-app purchases, starting at $0.49 per month. Plus42 asks for nothing beyond the download.

Plus42 holds the better App Store score, 4.9 against 3.1. That said, the two scores are not equally well evidenced: Plus42 has 79 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 92% of Plus42's written reviews are positive against 67% of RLM's.

Plus42 ships an update weekly, RLM every 5 weeks. The most recent releases landed on September 22, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Plus42 | RLM |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.9 (79 ratings)](https://appshunter.io/ios/app/plus42/id1597963622/reviews)** | [3.1 (7 ratings)](https://appshunter.io/ios/app/rlm-11cx/id1630739014/reviews) |
| Number of ratings | **79** | 7 |
| Positive reviews | **92.3% of reviews** | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 5 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | **#110** | — |
| Size | 11 MB | 6 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Okken](https://appshunter.io/developer/337692632) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## What reviewers say

### Plus42

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

**Currently charting:** #110 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


### RLM

[App page](https://appshunter.io/ios/app/rlm-11cx/id1630739014)

This app is a scientific and programmable calculator designed for science and engineering, replicating the functionality of the HP-11C. It offers extensive features for finance, business, statistics, complex numbers, and unit conversions, with a programmable interface for custom calculations.

**Highlights:** Finance calculations (amortization, bond price, Black-Scholes), Business functions (break-even, currency exchange), Statistical analysis (regression, probability distributions), Scientific functions (complex numbers, logarithms, trigonometry), Unit and currency conversions, Programmable interface for custom scripts, Equation solver

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.49 | per month |
| Semi-Annual Subscription | $2.99 | per 6 months |
| Annual Subscription | $5.99 | per year |
| Lifetime Purchase | $9.99 | one-time |


## Frequently asked questions

### Is Plus42 free?

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

### Is RLM free?

RLM is free to download, with in-app purchases available.

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

Plus42 is rated higher. Plus42 averages 4.9 out of 5 from 79 ratings, while RLM averages 3.1 from 7 ratings.

### Do Plus42 or RLM have ads?

Neither Plus42 nor RLM shows ads.

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

Plus42 ships an update weekly, and RLM every 5 weeks. Most recently, Plus42 was updated on September 22, 2026 and RLM on September 10, 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.*