Comet Book vs Space Orbit
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.
Space Orbit
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・自由に宇宙船を発射してその軌道を眺める、ただそれだけのアプリです。 ・画面のどこかをスワイプすると宇宙船が発射されます。 ・発射された宇宙船は地球と月の重力に従い運動を続けます。 ・好きな場所から宇宙船を発射し、その軌道を眺めて楽しんでください。 ・詳細は以下サイトをご覧ください。 https://zenn.dev/ta168/articles/space-orbit_app - This app is just for enjoying watching orbits. - Swipe anywhere on the screen to launch a spacecraft. - Once launched, the spacecraft will continue to move under the gravity of Earth and the Moon. - Launch spacecraft from anywhere and enjoy watching their orbits. - Check out the homepage below for details. https://zenn.dev/ta168/articles/space-orbit_app
Screenshots
Verdict
The clearest difference is update cadence: Space Orbit at daily against Comet Book's every 6 months. Comet Book's advantage is iOS requirement (12.0 vs 15.6). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Comet Book ships an update every 6 months, Space Orbit daily. The most recent releases landed on September 21, 2026 and September 12, 2026 respectively.
| Parameter | Comet Book | Space Orbit |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 54.9% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 6 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 10 MB | 4 MB |
| Age rating | 9+ | 4+ |
| Developer | Vixen Co.,Ltd. | TOSHIYA ARAI |
In-app purchases
Comet Book
No in-app purchases
Space Orbit
No in-app purchases
