Comparison

Three vs AeroRotationSim

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Three

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
Read full description

1. For a batter observation, all volumes are enlarged by many times (the range of gravity in the real universe is much larger, and the planet is much smaller, so don’t worry about breaking the Roche limit) 2. Users can add up to 7 Sun, and randomly distribute them to nearby spaces. 3. Users can add an asteroid matrix. Asteroids have no gravity (negligibly small in the reality) and are only affected by Suns. (Well, in fact, it is afraid that the cpu is limited, and it is impossible to calculate the mutual gravitational force of too many stars.) 4. The three-body system is very unstable, and it is prone to gravitational slingshot effect. If a star is too far away from other stars, it may never come back. 5. However, users can also turn on an additional r/10 parameter to increase the gravitational force of stars at a long distance and make it return to the system (after turning on the parameter, it can only be used for demonstration, and the data has no reference value).

About

AeroRotationSim

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
Read full description

This app is designed as a learning aid for students of aerospace engineering or physics. It focuses on the attitude and rotational dynamics of rigid bodies. Use it to learn about Euler angles, quaternions, direction cosine matrices, angular velocity and momentum, space and body cones, Poinsot's construction, gravity gradient torque, and attitude control system torque.

Screenshots

Three4 screens
AeroRotationSim1 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard5 real differences · 5 level
Three versus AeroRotationSim: the parameters behind the verdict, then further details
ParameterThreeAeroRotationSim
Price$0.99Free — better
Rating2.0 (4 ratings)4.5 (2 ratings) — better
Positive reviews50.0% of reviews—
Number of ratings4 — better2
Update frequencyWeekly — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better18.5
Further details — not scored
Size72 MB7 MB
Age rating4+4+
Developer骐显 梁Roger Eastman

Customer experience

Three

All ratings4 ratings
Positive25.0%
Neutral0.0%
Negative75.0%
Written reviews4 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

AeroRotationSim

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Three

No in-app purchases

None

AeroRotationSim

No in-app purchases

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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