# A2io vs RLM

The clearest difference is in-app purchases: A2io at none against RLM's 4. A2io also leads on iOS requirement (12.0 vs 15.0). RLM's advantage is update cadence (every 5 weeks vs every 43 months). 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. A2io asks for nothing beyond the download.

A2io ships an update every 43 months, RLM every 5 weeks. The most recent releases landed on October 10, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | A2io | RLM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.1 (7 ratings)](https://appshunter.io/ios/app/rlm-11cx/id1630739014/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 43 months | **Every 5 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 35 MB | 6 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Aaron Reid](https://appshunter.io/developer/1535274665) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## What reviewers say

### A2io

[App page](https://appshunter.io/ios/app/a2io/id1535274663)

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is A2io free?

A2io is free to download, with no in-app purchases.

### Is RLM free?

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

### Do A2io or RLM have ads?

Neither A2io nor RLM shows ads.

### Which is updated more often, A2io or RLM?

A2io ships an update every 43 months, and RLM every 5 weeks. Most recently, A2io was updated on October 10, 2026 and RLM on September 30, 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.*