Alien Planets vs Solar System Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Alien Planets
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Get all the information about these amazing new worlds that may host alien life and be a home for humanity in future. New discovered planets are automatically added so you get the very latest discovers, facts and data continuously. The perfect app for all astronomy enthusiasts, students, sky watchers and all people who want to discover beyond deep space. Synchronised with latest data from NASA
Solar System Viewer
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.
- Simulate planetary orbits
- Adjust time speed
- Time travel to specific dates
- Home screen widgets
- Apple Watch integration
- View planet overviews
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8Planets is a simple viewer and simulator for planetary orbits in our Solar System. 8Planets helps you discover how the planets aligned and move around over time so that you feel the scale of the Solar System or even the Universe. By giving you quick and easy access to the Solar System everywhere, 8Planets will make you feel that the Solar System is close to us. FEATURES ・Planetary Motion Speed up or slow down time to see how the planets rotate over time and grasp the scale of the Solar System. ・Time Travel Travel back or forward in time to view the Solar System or planetary positions on any given date. ・Widgets Widgets allow you to display the real-time Solar System on your Home Screen. ・Watch View the Solar System on your wrist and use Digital Crown to travel back or forward in time. ・Others Apple Watch Complications, Overview of the planets, Option to show Pluto, Sharing your favorite moment of the Solar System, URL Scheme, and more.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Alien Planets | Solar System Viewer |
|---|---|---|
| Price | $9.99 | $2.99 — better |
| Rating | — | 4.4 (28 ratings) — better |
| Positive reviews | — | 83.3% of reviews |
| Number of ratings | — | 28 — better |
| Update frequency | Every 27 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Paid |
| Devices | iPhone, iPad | iPhone, iPad, Mac, Apple Watch — better |
| Requires iOS | 18.2 — better | 26.0 |
| Further details — not scored | ||
| Size | 34 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Jose Leal | BLUE COMET LABS LLC |
In-app purchases
Alien Planets
No in-app purchases
Solar System Viewer
- Io Tip$1.99
- Europa Tip$3.99
- Ganymede Tip$5.99
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- Callisto Tip$9.99
Questions
Is Alien Planets free?
Is Solar System Viewer free?
Do Alien Planets or Solar System Viewer have ads?
Which is updated more often, Alien Planets or Solar System Viewer?
Other comparisons
