# Roughness vs AeroRotationSim

The clearest difference is update cadence: AeroRotationSim at every 6 months against Roughness's every 14 months. Roughness's advantage is iOS requirement (15.0 vs 18.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Roughness ships an update every 14 months, AeroRotationSim every 6 months. The most recent releases landed on October 14, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Roughness | AeroRotationSim |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (2 ratings)](https://appshunter.io/ios/app/aerorotationsim/id6754519216/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 6 months** |
| Monetization | — | Free |
| Size | 26 MB | 7 MB |
| Requires iOS | **15.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Carl Zeiss AG](https://appshunter.io/developer/488066215) | [Roger Eastman](https://appshunter.io/developer/1791448556) |

## What reviewers say

### Roughness

[App page](https://appshunter.io/ios/app/roughness/id1356085703)

**In-app purchases:** none


### AeroRotationSim

[App page](https://appshunter.io/ios/app/aerorotationsim/id6754519216)

This educational tool helps aerospace and physics students understand the rotational dynamics of rigid bodies. It covers key concepts like Euler angles, quaternions, and angular momentum, aiding in the study of attitude control systems.

**Highlights:** Euler angles, Quaternions, Direction cosine matrices, Angular velocity and momentum, Space and body cones, Poinsot's construction, Gravity gradient torque, Attitude control system torque

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Roughness free?

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

### Is AeroRotationSim free?

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

### Do Roughness or AeroRotationSim have ads?

Neither Roughness nor AeroRotationSim shows ads.

### Which is updated more often, Roughness or AeroRotationSim?

Roughness ships an update every 14 months, and AeroRotationSim every 6 months. Most recently, Roughness was updated on October 14, 2026 and AeroRotationSim on October 22, 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.*