# RLM vs HP

The clearest difference is rating: HP at 5.0 against RLM's 3.1. HP also leads on in-app purchases (none vs 4) and review sentiment (100% vs 67%). RLM's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.2). On price, ratings volume and ads there is nothing between them.

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

HP holds the better App Store score, 5.0 against 3.1. Both are backed by a comparable volume of ratings — 7 and 5 respectively. Written reviews point the same way: 67% of RLM's written reviews are positive against 100% of HP's.

RLM ships an update every 5 weeks, HP every 11 days. The most recent releases landed on September 10, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | RLM | HP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (7 ratings)](https://appshunter.io/ios/app/rlm-11cx/id1630739014/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/hp-35/id6738010641/reviews)** |
| Number of ratings | **7** | 5 |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 11 days** |
| Monetization | Free with in-app purchases | **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-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 |


### 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?

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

### 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 5 weeks, and HP every 11 days. Most recently, RLM was updated on September 10, 2026 and HP 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.*