# Comet Book vs ABIEdu

The clearest difference is in-app purchases: Comet Book at none against ABIEdu's 2. Comet Book also leads on iOS requirement (12.0 vs 15.1). ABIEdu's advantage is update cadence (every 5 days vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. ABIEdu sells 2 in-app purchases, starting at $12.99 per month. Comet Book asks for nothing beyond the download.

Comet Book ships an update every 6 months, ABIEdu every 5 days. The most recent releases landed on November 1, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Comet Book | ABIEdu |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/comet-book/id604782335/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 54.9% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 days** |
| Monetization | Free | — |
| Size | 10 MB | 19 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [Dr Sriram Ananthan](https://appshunter.io/developer/1895466686) |

## 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


### ABIEdu

[App page](https://appshunter.io/ios/app/abiedu/id6763738085)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Individual Pro | $12.99 | per month |
| Faculty Pro | $19.99 | per month |


## Frequently asked questions

### Is Comet Book free?

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

### Is ABIEdu free?

ABIEdu is free to download, with in-app purchases available.

### Do Comet Book or ABIEdu have ads?

Neither Comet Book nor ABIEdu shows ads.

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

Comet Book ships an update every 6 months, and ABIEdu every 5 days. Most recently, Comet Book was updated on November 1, 2026 and ABIEdu on November 5, 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.*