# Comet Book vs NEOScope

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.

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.

## The numbers

| Metric | Comet Book | NEOScope |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/comet-book/id604782335/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/neoscope/id6477293859/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 54.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 7 months |
| Monetization | **Free** | Paid |
| Size | 10 MB | 11 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [Christopher Bookmyer](https://appshunter.io/developer/1699500539) |

## What reviewers say

### Comet Book

[App page](https://appshunter.io/ios/app/comet-book/id604782335)

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.

**Highlights:** Comet viewing direction and elevation, Real-time celestial object tracking, 3D Solar System mode, Visualize comet and planet motion, Observing site guidance

**In-app purchases:** none


### NEOScope

[App page](https://appshunter.io/ios/app/neoscope/id6477293859)

Explore and track celestial objects with real-time data. Examine their size, speed, and proximity to Earth. Discover fascinating details about near-Earth objects.

**Highlights:** Track Near Earth Objects, Examine size, speed, and close calls, Utilizes NASA's NeoWs API, Detailed object information

**In-app purchases:** none


## Frequently asked questions

### Is Comet Book free?

Comet Book is free to download, with no in-app purchases.

### Is NEOScope free?

NEOScope costs $0.99, with no in-app purchases.

### Which has better reviews, Comet Book or NEOScope?

Comet Book and NEOScope are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do Comet Book or NEOScope have ads?

Neither Comet Book nor NEOScope shows ads.

### Which is updated more often, Comet Book or NEOScope?

Comet Book ships an update every 6 months, and NEOScope every 7 months. Most recently, Comet Book was updated on October 15, 2026 and NEOScope on October 17, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*