SaturnMoons vs Planet Rotation
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SaturnMoons
Explore Saturn's rings and moons with this interactive guide. Pinpoint the location of its largest moons and step through time to see their future positions. Discover fascinating facts and images of Saturn's unique lunar family.
- Locate Saturn's nine largest moons
- Pinch-zoomable interface
- Local time synchronization
- Time controls (seconds, hours, days, years)
- Customizable telescope view
- Encyclopedia of Saturn's moons
- Stunning images of moons
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Let SaturnMoons guide you to observing Saturn’s complex system of rings and moons. Sky & Telescope’s latest app helps you locate Saturn’s nine largest moons with a pinch-zoomable interface set to your local time, guiding you to Saturn’s largest moon, Titan, or helping you try your luck with the fainter moons. The time controls allow you to step through the seconds or hours, or speed through days or even years to see where the moons will be down the line. And you can flip the view to customize what you see through your telescope. Plus, our full encyclopedia section contains fascinating entries and stunning images of Saturn’s bizarre lunar family. Learn more about Saturn’s “death star” moon, Mimas, two-faced Iapetus, and the salty ocean frothing beneath Enceladus’s surface. Please note: this application is designed to work in landscape orientation only so that you may view Saturn, Saturn’s rings, and the lunar family at their best.
Planet Rotation
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The screen at startup is the earth.The equatorial inclination angle of the earth is 23.4 degrees.Equatorial inclination angle is the angle between the equatorial plane and the orbital plane of a planet that revolves while rotating. The equatorial inclination angle of the mercury is 0.027 degrees.The rotation axis is upright almost vertically. The equatorial inclination angle of the venus is 177.36 degrees.The rotation axis is almost completely inverted, and it rotates in the opposite direction. The equatorial inclination angle of the mars is 25 degrees.The axis of rotation is a gradient close to the earth. You can change the rotation speed of the planet.The equatorial inclination angle of the jupiter is 3.08 degrees.The rotation axis is upright almost vertically. When you press the button, the angle of the sun changes by 30 degrees each time. The fastest thing is one revolution per second.The slowest thing is one rotation in 300 seconds (5 minutes). When checked, reverse rotation will occur.
Screenshots
Verdict
The clearest difference is update cadence: Planet Rotation at every 10 months against SaturnMoons's every 26 months. Planet Rotation also leads on price ($0.99 vs $2.99). SaturnMoons's advantage is iOS requirement (8.0 vs 15.0). On 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
SaturnMoons costs $2.99 and Planet Rotation $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SaturnMoons ships an update every 26 months, Planet Rotation every 10 months. The most recent releases landed on October 29, 2026 and October 8, 2026 respectively.
| Parameter | SaturnMoons | Planet Rotation |
|---|---|---|
| Price | $2.99 | $0.99 — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 40.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 26 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 36 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Guidebook Inc | Masahiro Tomosada |
In-app purchases
SaturnMoons
No in-app purchases
Planet Rotation
No in-app purchases
Questions
Is SaturnMoons free?
Is Planet Rotation free?
Do SaturnMoons or Planet Rotation have ads?
Which is updated more often, SaturnMoons or Planet Rotation?
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