# RPN vs RLM

The clearest difference is price: RLM at Free against RPN's $1.99. RLM also leads on update cadence (every 4 weeks vs every 3 months). RPN's advantage is in-app purchases (none vs 4) and review sentiment (100% vs 67%). On rating, ratings volume, ads and device support there is nothing between them.

RLM is free to download; RPN costs $1.99 up front. RLM sells 4 in-app purchases, starting at $0.49 per month. RPN asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for RPN against 4.9 for RLM. Both are backed by a comparable volume of ratings — 8 and 7 respectively. Written reviews are what separate them: 100% of RPN's written reviews are positive against 67% of RLM's.

RPN ships an update every 3 months, RLM every 4 weeks. The most recent releases landed on November 4, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | RPN | RLM |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/rpn-55-sd/id1469907917/reviews)** | [4.9 (7 ratings)](https://appshunter.io/ios/app/rlm-19bx/id1597086394/reviews) |
| Number of ratings | **8** | 7 |
| Positive reviews | **100.0% of reviews** | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 17 MB | 7 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-55-sd/id1469907917)

This app is a photo-realistic simulation of a classic Hewlett-Packard programmable scientific calculator from the 1970s. It includes a 100-hour digital timer, clock functions, and original HP programs.

**Highlights:** Photo-realistic look-and-feel, Programmable with conditional branching, 100-hr timer and 12/24-hr clock, Original HP programs built-in, Extended features for enhanced usability, Sharing via email, AirDrop, and more

**Features:** macOS Compatibility

**In-app purchases:** none


### RLM

[App page](https://appshunter.io/ios/app/rlm-19bx/id1597086394)

This app offers a comprehensive suite of financial, business, scientific, and statistical calculators. It includes specialized worksheets for loan amortization, bond pricing, currency exchange, probability distributions, and complex number operations. Users can also perform date and time calculations, solve arbitrary equations, and convert units.

**Highlights:** Finance worksheets (amortization, bonds, options), Business tools (bill split, break-even, currency), Statistical analysis (probability, regressions), Scientific functions (complex numbers, vectors), Unit and currency conversions, Equation solver, Date and time calculations

**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 |


## Frequently asked questions

### Is RPN free?

RPN 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 or RLM?

RPN is rated higher. RPN averages 5.0 out of 5 from 8 ratings, while RLM averages 4.9 from 7 ratings.

### Do RPN or RLM have ads?

Neither RPN nor RLM shows ads.

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

RPN ships an update every 3 months, and RLM every 4 weeks. Most recently, RPN was updated on November 4, 2026 and RLM on November 3, 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.*