# RLM vs SwiftRPN

The clearest difference is rating: SwiftRPN at 5.0 against RLM's 3.1. SwiftRPN also leads on in-app purchases (none vs 4). RLM's advantage is update cadence (every 5 weeks vs every 14 months) and ratings volume (7 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. RLM sells 4 in-app purchases, starting at $0.49 per month. SwiftRPN asks for nothing beyond the download.

SwiftRPN holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: RLM has 7 ratings behind it against 1, so its average is the more settled of the two.

RLM ships an update every 5 weeks, SwiftRPN every 14 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | RLM | SwiftRPN |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (7 ratings)](https://appshunter.io/ios/app/rlm-11cx/id1630739014/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/swiftrpn/id6470951024/reviews)** |
| Number of ratings | **7** | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 14 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 6 MB | 3 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [R.L.M. Software](https://appshunter.io/developer/289639238) | [Patrick Gelvin](https://appshunter.io/developer/1573354051) |

## What reviewers say

### 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 |


### SwiftRPN

[App page](https://appshunter.io/ios/app/swiftrpn/id6470951024)

This utility app provides a powerful Reverse Polish Notation (RPN) calculator with advanced features. It supports scalar types, vectors, and matrices, along with extensive built-in operators and unit conversions. Easily switch between number bases and visualize results.

**Highlights:** RPN stack for efficient calculations, Support for scalar, vector, and matrix types, 84 built-in operators with documentation, 74 built-in units for conversion, Multiple number base input and output (binary, octal, decimal, hex), BigInt support for integer calculations

**In-app purchases:** none


## Frequently asked questions

### Is RLM free?

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

### Is SwiftRPN free?

SwiftRPN is free to download, with no in-app purchases.

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

SwiftRPN is rated higher. RLM averages 3.1 out of 5 from 7 ratings, while SwiftRPN averages 5.0 from 1 ratings.

### Do RLM or SwiftRPN have ads?

Neither RLM nor SwiftRPN shows ads.

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

RLM ships an update every 5 weeks, and SwiftRPN every 14 months. Most recently, RLM was updated on October 24, 2026 and SwiftRPN 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.*