# RLM vs HP16C

The clearest difference is in-app purchases: HP16C at none against RLM's 1. HP16C also leads on update cadence (every 8 days vs every 4 weeks). RLM's advantage is iOS requirement (15.0 vs 17.0). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. RLM sells 1 one-off in-app purchase. HP16C asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for RLM against 5.0 for HP16C. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

RLM ships an update every 4 weeks, HP16C every 8 days. The most recent releases landed on September 10, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | RLM | HP16C |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/rlm-10cx/id6466089794/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/hp16c/id6761774728/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 8 days** |
| Monetization | Free | Free |
| Size | 6 MB | 1 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [R.L.M. Software](https://appshunter.io/developer/289639238) | [Michael Doornbos](https://appshunter.io/developer/1891405652) |

## What reviewers say

### 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 |


### HP16C

[App page](https://appshunter.io/ios/app/hp16c/id6761774728)

This app faithfully recreates the legendary HP 16C Computer Scientist calculator, offering advanced hex arithmetic, bit manipulation, and base conversion. It features RPN, keystroke programming, and modern enhancements like a two-line display and haptic feedback.

**Highlights:** Full RPN calculator, Integer arithmetic (HEX, DEC, OCT, BIN), Configurable word size (1-64 bits), Complete bit operations, Keystroke programming, Two-line display, Haptic feedback

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RLM free?

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

### Is HP16C free?

HP16C is free to download, with no in-app purchases.

### Which has better reviews, RLM or HP16C?

RLM and HP16C are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do RLM or HP16C have ads?

Neither RLM nor HP16C shows ads.

### Which is updated more often, RLM or HP16C?

RLM ships an update every 4 weeks, and HP16C every 8 days. Most recently, RLM was updated on September 10, 2026 and HP16C on September 21, 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.*