# Three vs AeroRotationSim

The clearest difference is price: AeroRotationSim at Free against Three's $0.99. AeroRotationSim also leads on rating (4.5 vs 2.0). Three's advantage is update cadence (weekly vs every 6 months) and iOS requirement (12.0 vs 18.5). On ratings volume, ads, in-app purchases and device support there is nothing between them.

AeroRotationSim is free to download; Three costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

AeroRotationSim holds the better App Store score, 4.5 against 2.0. Both are backed by a comparable volume of ratings — 4 and 2 respectively.

Three ships an update weekly, AeroRotationSim every 6 months. The most recent releases landed on October 27, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Three | AeroRotationSim |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [2.0 (4 ratings)](https://appshunter.io/ios/app/three-body-simulator/id6446972716/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/aerorotationsim/id6754519216/reviews)** |
| Number of ratings | **4** | 2 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 6 months |
| Monetization | Paid | **Free** |
| Size | 72 MB | 7 MB |
| Requires iOS | **12.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [骐显 梁](https://appshunter.io/developer/1314814852) | [Roger Eastman](https://appshunter.io/developer/1791448556) |

## What reviewers say

### Three

[App page](https://appshunter.io/ios/app/three-body-simulator/id6446972716)

Explore celestial mechanics by simulating gravitational interactions between multiple celestial bodies. Users can add up to seven suns and an asteroid matrix to observe complex orbital behaviors and gravitational slingshot effects. The app allows for adjustments to gravity parameters for demonstration purposes.

**Highlights:** Multi-body gravitational simulation, Add up to 7 suns, Asteroid matrix simulation, Observe gravitational slingshots, Adjustable gravity parameters for demonstration, Enlarged volumes for better observation

**Features:** macOS Compatibility

**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 Three free?

Three costs $0.99, with no in-app purchases.

### Is AeroRotationSim free?

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

### Which has better reviews, Three or AeroRotationSim?

AeroRotationSim is rated higher. Three averages 2.0 out of 5 from 4 ratings, while AeroRotationSim averages 4.5 from 2 ratings.

### Do Three or AeroRotationSim have ads?

Neither Three nor AeroRotationSim shows ads.

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

Three ships an update weekly, and AeroRotationSim every 6 months. Most recently, Three was updated on October 27, 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.*