# A Complex Calc vs RLM

The clearest difference is in-app purchases: A Complex Calc at none against RLM's 1. A Complex Calc also leads on ratings volume (25 vs 1) and iOS requirement (18.0 vs 26.0). RLM's advantage is rating (5.0 vs 4.7). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. RLM sells 1 one-off in-app purchase. A Complex Calc asks for nothing beyond the download.

RLM holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: A Complex Calc has 25 ratings behind it against 1, so its average is the more settled of the two.

A Complex Calc ships an update every 3 weeks, RLM monthly. Both last shipped on November 13, 2026.

## The numbers

| Metric | A Complex Calc | RLM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (25 ratings)](https://appshunter.io/ios/app/a-complex-calc/id1372571548/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rlm-10cx/id6466089794/reviews)** |
| Number of ratings | **25** | 1 |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free | Free |
| Size | 9 MB | 7 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Antonio Ruffolo](https://appshunter.io/developer/1372571547) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## What reviewers say

### A Complex Calc

[App page](https://appshunter.io/ios/app/a-complex-calc/id1372571548)

Perform complex calculations with a modern, user-friendly interface. Offers both basic and scientific modes, including support for complex numbers and advanced functions. This lightweight application provides a history of computations and is completely free with no advertisements.

**Highlights:** Complex number support, Basic and Scientific modes, History of operations, Trigonometric and hyperbolic functions, Random number generation, Lightweight app size

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is A Complex Calc free?

A Complex Calc 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, A Complex Calc or RLM?

RLM is rated higher. A Complex Calc averages 4.7 out of 5 from 25 ratings, while RLM averages 5.0 from 1 ratings.

### Do A Complex Calc or RLM have ads?

Neither A Complex Calc nor RLM shows ads.

### Which is updated more often, A Complex Calc or RLM?

A Complex Calc ships an update every 3 weeks, and RLM monthly. Most recently, A Complex Calc was updated on November 13, 2026 and RLM on November 13, 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.*