# RPN Calculus vs RLM

The clearest difference is price: RLM at Free against RPN Calculus's $1.99. RLM also leads on rating (5.0 vs 4.0) and update cadence (every 4 weeks vs every 4 months). RPN Calculus's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 15.0). On ratings volume and ads there is nothing between them.

RLM is free to download; RPN Calculus costs $1.99 up front. RLM sells 1 one-off in-app purchase. RPN Calculus asks for nothing beyond the download.

RLM holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

RPN Calculus ships an update every 4 months, RLM every 4 weeks. The most recent releases landed on October 14, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | RPN Calculus | RLM |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/rpn-calculus/id374359458/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rlm-10cx/id6466089794/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 weeks** |
| Monetization | Paid | **Free** |
| Size | 11 MB | 6 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Braun](https://appshunter.io/developer/296553965) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## 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


### RLM

[App page](https://appshunter.io/ios/app/rlm-10cx/id6466089794)

This scientific calculator offers a comprehensive suite of tools for finance, business, statistics, and complex scientific calculations. It emulates a classic calculator while leveraging modern iOS device capabilities for ease of use and advanced functions.

**Highlights:** Finance and Business calculations, Date and Time interval calculations, Advanced Statistics and Curve Fitting, Complex Numbers and 3D Vectors, Unit and Currency Conversions, Equation Solver, Programmable functions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Purchase | $9.99 | one-time |


## Frequently asked questions

### Is RPN Calculus free?

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

### Is RLM free?

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

### Which has better reviews, RPN Calculus or RLM?

RLM is rated higher. RPN Calculus averages 4.0 out of 5 from 1 ratings, while RLM averages 5.0 from 1 ratings.

### Do RPN Calculus or RLM have ads?

Neither RPN Calculus nor RLM shows ads.

### Which is updated more often, RPN Calculus or RLM?

RPN Calculus ships an update every 4 months, and RLM every 4 weeks. Most recently, RPN Calculus was updated on October 14, 2026 and RLM on September 30, 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.*