# Solar System Viewer vs Three

The clearest difference is rating: Solar System Viewer at 4.4 against Three's 2.0. Solar System Viewer also leads on review sentiment (83% vs 50%) and ratings volume (28 vs 4). Three's advantage is in-app purchases (none vs 4) and update cadence (weekly vs every 2 months). On ads, monetization model and device support there is nothing between them.

Solar System Viewer costs $2.99 and Three $0.99 up front. Solar System Viewer sells 4 one-off in-app purchases. Three asks for nothing beyond the download.

Solar System Viewer holds the better App Store score, 4.4 against 2.0. That said, the two scores are not equally well evidenced: Solar System Viewer has 28 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 83% of Solar System Viewer's written reviews are positive against 50% of Three's.

Solar System Viewer ships an update every 2 months, Three weekly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Solar System Viewer | Three |
| --- | --- | --- |
| Price | $2.99 | **$0.99** |
| Rating | **[4.4 (28 ratings)](https://appshunter.io/ios/app/solar-system-viewer-8planets/id1554639445/reviews)** | [2.0 (4 ratings)](https://appshunter.io/ios/app/three-body-simulator/id6446972716/reviews) |
| Number of ratings | **28** | 4 |
| Positive reviews | **83.3% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Paid | Paid |
| Size | 22 MB | 72 MB |
| Requires iOS | 26.0 | **12.0** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BLUE COMET LABS LLC](https://appshunter.io/developer/1492055170) | [骐显 梁](https://appshunter.io/developer/1314814852) |

## What reviewers say

### Solar System Viewer

[App page](https://appshunter.io/ios/app/solar-system-viewer-8planets/id1554639445)

Explore and simulate the orbits of planets in our solar system. This app allows you to speed up or slow down time, travel to any date, and view planetary positions. It also offers widgets for your home screen and Apple Watch complications.

**Highlights:** Simulate planetary orbits, Adjust time speed, Time travel to specific dates, Home screen widgets, Apple Watch integration, View planet overviews

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Io Tip | $1.99 | one-time |
| Europa Tip | $3.99 | one-time |
| Ganymede Tip | $5.99 | one-time |
| Callisto Tip | $9.99 | one-time |


### 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


## Frequently asked questions

### Is Solar System Viewer free?

Solar System Viewer costs $2.99, and also offers in-app purchases.

### Is Three free?

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

### Which has better reviews, Solar System Viewer or Three?

Solar System Viewer is rated higher. Solar System Viewer averages 4.4 out of 5 from 28 ratings, while Three averages 2.0 from 4 ratings.

### Do Solar System Viewer or Three have ads?

Neither Solar System Viewer nor Three shows ads.

### Which is updated more often, Solar System Viewer or Three?

Solar System Viewer ships an update every 2 months, and Three weekly. Most recently, Solar System Viewer was updated on October 24, 2026 and Three on October 24, 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.*