# Stack RPN Calculator vs RLM

The clearest difference is review sentiment: RLM at 80% against Stack RPN Calculator's 33%. RLM also leads on rating (4.1 vs 3.5) and ratings volume (17 vs 2). Stack RPN Calculator's advantage is in-app purchases (none vs 4) and iOS requirement (11.0 vs 15.0). 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. Stack RPN Calculator asks for nothing beyond the download.

RLM holds the better App Store score, 4.1 against 3.5. That said, the two scores are not equally well evidenced: RLM has 17 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 33% of Stack RPN Calculator's written reviews are positive against 80% of RLM's.

## The numbers

| Metric | Stack RPN Calculator | RLM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (2 ratings)](https://appshunter.io/ios/app/stack-rpn-calculator/id1493986697/reviews) | **[4.1 (17 ratings)](https://appshunter.io/ios/app/rlm-15cx/id1636646608/reviews)** |
| Number of ratings | 2 | **17** |
| Positive reviews | 33.3% of reviews | **80.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 6 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Dario Bersiga](https://appshunter.io/developer/668388549) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## What reviewers say

### Stack RPN Calculator

[App page](https://appshunter.io/ios/app/stack-rpn-calculator/id1493986697)

This scientific calculator displays major functions on screen and utilizes a stack for calculations. It supports a stack of up to 4 values but can store many more numbers depending on device memory.

**Highlights:** Visible scientific functions, RPN (Reverse Polish Notation) input, Stack display for up to 4 values, Large number storage capacity, Designed for iPhone and iPad

**Features:** macOS Compatibility

**In-app purchases:** none


### RLM

[App page](https://appshunter.io/ios/app/rlm-15cx/id1636646608)

This advanced scientific calculator emulates the functionality of the HP-15C, offering comprehensive tools for finance, business, statistics, and scientific calculations. It supports programming, equation solving, and unit conversions, optimized for iOS devices.

**Highlights:** Programmable advanced scientific calculator, Finance and business calculation menus, Statistics and probability functions, Complex numbers and matrix operations, Unit and currency conversions, Equation solver and programming capabilities

**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 |
| One-Time Purchase | $9.99 | one-time |


## Frequently asked questions

### Is Stack RPN Calculator free?

Stack RPN Calculator is free to download, with no in-app purchases.

### Is RLM free?

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

### Which has better reviews, Stack RPN Calculator or RLM?

RLM is rated higher. Stack RPN Calculator averages 3.5 out of 5 from 2 ratings, while RLM averages 4.1 from 17 ratings.

### Do Stack RPN Calculator or RLM have ads?

Neither Stack RPN Calculator nor RLM shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*