# Alien Planets vs Solar System Viewer

The clearest difference is in-app purchases: Alien Planets at none against Solar System Viewer's 4. Alien Planets also leads on iOS requirement (18.2 vs 26.0). Solar System Viewer's advantage is price ($2.99 vs $9.99) and update cadence (every 2 months vs every 27 months). On ads there is nothing between them.

Alien Planets costs $9.99 and Solar System Viewer $2.99 up front. Solar System Viewer sells 4 one-off in-app purchases. Alien Planets asks for nothing beyond the download.

Alien Planets ships an update every 27 months, Solar System Viewer every 2 months. The most recent releases landed on September 9, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Alien Planets | Solar System Viewer |
| --- | --- | --- |
| Price | $9.99 | **$2.99** |
| Rating | — | **[4.4 (28 ratings)](https://appshunter.io/ios/app/solar-system-viewer-8planets/id1554639445/reviews)** |
| Number of ratings | — | **28** |
| Positive reviews | — | 83.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 2 months** |
| Monetization | — | Paid |
| Size | 34 MB | 22 MB |
| Requires iOS | **18.2** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Jose Leal](https://appshunter.io/developer/1441468562) | [BLUE COMET LABS LLC](https://appshunter.io/developer/1492055170) |

## What reviewers say

### Alien Planets

[App page](https://appshunter.io/ios/app/alien-planets/id1478121868)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Alien Planets free?

Alien Planets costs $9.99, with no in-app purchases.

### Is Solar System Viewer free?

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

### Do Alien Planets or Solar System Viewer have ads?

Neither Alien Planets nor Solar System Viewer shows ads.

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

Alien Planets ships an update every 27 months, and Solar System Viewer every 2 months. Most recently, Alien Planets was updated on September 9, 2026 and Solar System Viewer on September 18, 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.*