Comet Book vs NEOScope
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.
NEOScope
Explore and track celestial objects with real-time data. Examine their size, speed, and proximity to Earth. Discover fascinating details about near-Earth objects.
- Track Near Earth Objects
- Examine size, speed, and close calls
- Utilizes NASA's NeoWs API
- Detailed object information
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Track Near Earth Objects with NASA's NeoWs API. Examine NEO size, speed, close calls & more!
Screenshots
Verdict
Comet Book and NEOScope both sit at 5.0 stars, but that hides the real split: 100% of NEOScope's written reviews are positive against 55% of Comet Book's. Comet Book's advantage is price (Free vs $0.99) and device support (3 vs 1). On rating, ratings volume, update cadence and 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
Comet Book is free to download; NEOScope costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Comet Book against 5.0 for NEOScope. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews are what separate them: 55% of Comet Book's written reviews are positive against 100% of NEOScope's.
Comet Book ships an update every 6 months, NEOScope every 7 months. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.
| Parameter | Comet Book | NEOScope |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 5.0 (2 ratings) | 5.0 (1 ratings) |
| Positive reviews | 54.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 6 months — better | Every 7 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 10 MB | 11 MB |
| Age rating | 9+ | 4+ |
| Developer | Vixen Co.,Ltd. | Christopher Bookmyer |
Customer experience
Comet Book
NEOScope
In-app purchases
Comet Book
No in-app purchases
NEOScope
No in-app purchases
