# Comet Book vs ASGuide

The clearest difference is review sentiment: ASGuide at 100% against Comet Book's 55%. ASGuide also leads on ratings volume (9 vs 2). Comet Book's advantage is rating (5.0 vs 4.8) and device support (3 vs 1). On price, update cadence, ads and in-app purchases 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 holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 2 and 9 respectively. Written reviews complicate that: 55% of Comet Book's written reviews are positive against 100% of ASGuide's, so the app with the better star average is not the one people write more warmly about.

Comet Book ships an update every 6 months, ASGuide every 4 months. The most recent releases landed on September 21, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | Comet Book | ASGuide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/comet-book/id604782335/reviews)** | [4.8 (9 ratings)](https://appshunter.io/ios/app/asguide/id1500363899/reviews) |
| Number of ratings | 2 | **9** |
| Positive reviews | 54.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 10 MB | 33 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [Philip Perez](https://appshunter.io/developer/1500363898) |

## 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


### ASGuide

[App page](https://appshunter.io/ios/app/asguide/id1500363899)

Explore the night sky with this astronomy companion. Discover planets, galaxies, nebulae, and more visible from your location. Generate custom viewing lists and preview celestial objects with an interactive sky atlas.

**Highlights:** Discover celestial objects visible from your location, Generate custom viewing lists, View detailed observation information, Interactive sky atlas preview, Dark mode for nighttime viewing, Sunrise/sunset and moon phase dashboard

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

**In-app purchases:** none


## Frequently asked questions

### Is Comet Book free?

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

### Is ASGuide free?

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

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

Comet Book is rated higher. Comet Book averages 5.0 out of 5 from 2 ratings, while ASGuide averages 4.8 from 9 ratings.

### Do Comet Book or ASGuide have ads?

Neither Comet Book nor ASGuide shows ads.

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

Comet Book ships an update every 6 months, and ASGuide every 4 months. Most recently, Comet Book was updated on September 21, 2026 and ASGuide on September 1, 2026.

---

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