Comet Book vs Pocket Planets
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Comet Book
Discover and track comets with this educational app. It provides real-time direction and elevation data to help you locate celestial objects in the night sky. Explore the solar system in 3D and visualize the movement of comets and planets.
- Comet viewing direction and elevation
- Real-time celestial object tracking
- 3D Solar System mode
- Visualize comet and planet motion
- Observing site guidance
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The Comet Book app clearly shows when Comets can be viewed and in which direction. The direction and elevation of a Comet can change noticeably in a day due to its fast apparent motion. The moon and a bright planet may be convenient as a guide to find the comet though they have large apparent motion, too. This app determines where Comet is in the sky when it becomes visible at your observing site. You can easily start your observation of a Comet by using Comet Book as a guide to the direction and elevation of the comet. In addition, the new “3D Solar System seen from Space” mode allows you to view the motion of Comets and planets turning around the sun. Please take a look the comet’s movement around our solar system.
Pocket Planets
Explore our solar system with detailed information on planets, moons, and astronauts. Track who is currently in space and receive notifications for new launches. Access NASA images and compare celestial body characteristics.
- Detailed planet and moon data
- Astronaut information and missions
- Real-time space occupancy
- Launch notifications
- NASA image gallery
- Celestial body comparisons
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Pocket Planets gives you all the information you need about our solar system and human activity in space. Learn more about all 565 astronauts who been to space. What was their mission? How long had they been up there? See who is in space now! Get notified when somebody goes into space. Get up to date information about every planet and moon in the solar system. Including: - Physical characteristics: mass, radius, density, gravity, escape velocity - Orbital characteristics: real-time distance from the Sun and Earth, orbital period, orbital speed, eccentricity, apsis, periapsis, visualise orbit - Atmosphere: pressure, atmospheric composition - Images from Nasa - Moons: compare their size and distance
Screenshots
Verdict
The clearest difference is ads: Comet Book at none against Pocket Planets's shown. Comet Book also leads on rating (5.0 vs 4.6) and monetization model (free vs ad-supported). Pocket Planets's advantage is update cadence (every 3 weeks vs every 6 months) and review sentiment (67% vs 55%). On price, in-app purchases, device support and iOS requirement 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Comet Book holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Pocket Planets has 22 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 55% of Comet Book's written reviews are positive against 67% of Pocket Planets's, so the app with the better star average is not the one people write more warmly about.
Comet Book ships an update every 6 months, Pocket Planets every 3 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | Comet Book | Pocket Planets |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | 4.6 (22 ratings) |
| Positive reviews | 54.9% of reviews | 66.7% of reviews — better |
| Number of ratings | 3 | 22 — better |
| Update frequency | Every 6 months | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 10 MB | 66 MB |
| Age rating | 9+ | 4+ |
| Developer | Vixen Co.,Ltd. | Ad Lunam Kereskedelmi es Szolgaltato Korlatolt Felelossegu Tarsasag |
Customer experience
Comet Book
Pocket Planets
In-app purchases
Comet Book
No in-app purchases
Pocket Planets
No in-app purchases
Questions
Is Comet Book free?
Is Pocket Planets free?
Which has better reviews, Comet Book or Pocket Planets?
Do Comet Book or Pocket Planets have ads?
Which is updated more often, Comet Book or Pocket Planets?
Other comparisons
