# Comet Book vs AsteroTrack

The clearest difference is update cadence: Comet Book at every 6 months against AsteroTrack's every 17 months. Comet Book also leads on iOS requirement (12.0 vs 18.1). On price, ads, in-app purchases and device support there is nothing between them.

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, AsteroTrack every 17 months. The most recent releases landed on September 21, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Comet Book | AsteroTrack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/comet-book/id604782335/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 54.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 17 months |
| Monetization | Free | — |
| Size | 10 MB | 2 MB |
| Requires iOS | **12.0** | 18.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [Jose Gea](https://appshunter.io/developer/869882203) |

## 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


### AsteroTrack

[App page](https://appshunter.io/ios/app/asterotrack/id6739775100)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Comet Book free?

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

### Is AsteroTrack free?

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

### Do Comet Book or AsteroTrack have ads?

Neither Comet Book nor AsteroTrack shows ads.

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

Comet Book ships an update every 6 months, and AsteroTrack every 17 months. Most recently, Comet Book was updated on September 21, 2026 and AsteroTrack on September 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.*