# RLM vs HP

The clearest difference is in-app purchases: HP at none against RLM's 1. HP also leads on update cadence (every 11 days vs every 4 weeks) and ratings volume (5 vs 1). RLM's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.2). On price, rating, ads and monetization model there is nothing between them.

Both are free to download. RLM sells 1 one-off in-app purchase. HP 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 HP. That said, the two scores are not equally well evidenced: HP has 5 ratings behind it against 1, so its average is the more settled of the two.

RLM ships an update every 4 weeks, HP every 11 days. The most recent releases landed on September 30, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | RLM | HP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/rlm-10cx/id6466089794/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/hp-35/id6738010641/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 11 days** |
| Monetization | Free | Free |
| Size | 6 MB | 2 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [R.L.M. Software](https://appshunter.io/developer/289639238) | [Enrique Haro](https://appshunter.io/developer/1778874870) |

## 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 |


### HP

[App page](https://appshunter.io/ios/app/hp-35/id6738010641)

Emulates classic Hewlett Packard RPN scientific calculators from the 1970s. Experience the original HP-35, HP-45, and HP-21 models on your iPhone.

**Highlights:** RPN calculator emulation, HP-35 model, HP-45 model, HP-21 model, Classic scientific calculator interface

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

**In-app purchases:** none


## Frequently asked questions

### Is RLM free?

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

### Is HP free?

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

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

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

### Do RLM or HP have ads?

Neither RLM nor HP shows ads.

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

RLM ships an update every 4 weeks, and HP every 11 days. Most recently, RLM was updated on September 30, 2026 and HP on October 8, 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.*