# 星座早見 / Planisphere vs Sky Academy

The clearest difference is review sentiment: Sky Academy at 100% against 星座早見 / Planisphere's 0%. Sky Academy also leads on rating (4.9 vs 1.0) and ratings volume (197 vs 1). 星座早見 / Planisphere's advantage is in-app purchases (none vs 1) and update cadence (every 5 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Sky Academy sells 1 one-off in-app purchase. 星座早見 / Planisphere asks for nothing beyond the download.

Sky Academy holds the better App Store score, 4.9 against 1.0. That said, the two scores are not equally well evidenced: Sky Academy has 197 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of 星座早見 / Planisphere's written reviews are positive against 100% of Sky Academy's.

星座早見 / Planisphere ships an update every 5 weeks, Sky Academy every 4 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | 星座早見 / Planisphere | Sky Academy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/planisphere/id882653086/reviews) | **[4.9 (197 ratings)](https://appshunter.io/ios/app/sky-academy-learn-astronomy/id1571488252/reviews)** |
| Number of ratings | 1 | **197** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 277 MB | 45 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [IMAGE FACTORY CO., LTD.](https://appshunter.io/developer/882653089) | [Xiang Dong](https://appshunter.io/developer/1511041685) |

## What reviewers say

### 星座早見 / Planisphere

[App page](https://appshunter.io/ios/app/planisphere/id882653086)

This app simulates the night sky, displaying stars, planets, and the moon. It functions like a traditional planisphere but with added digital features, allowing users to easily view celestial positions and predict sunrise/sunset times.

**Highlights:** Real-time sky display, Planet and moon tracking, Interactive sky map, Sunrise/sunset prediction, Zoomable interface, Dark-friendly screen

**In-app purchases:** none


### Sky Academy

[App page](https://appshunter.io/ios/app/sky-academy-learn-astronomy/id1571488252)

Learn about constellations, stars, and deep sky objects through interactive levels and quizzes. Features realistic sky simulations, customizable learning paths, and offline access. Gamified approach makes astronomy engaging and accessible.

**Highlights:** Learn 88 constellations, 150+ stars, 110 Deep Sky Objects, 123+ levels for constellations, stars, and DSOs, Customizable learning lists, Three difficulty modes per level, Realistic night sky simulation, Offline access, no ads

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Premium | $4.99 | one-time |


## Frequently asked questions

### Is 星座早見 / Planisphere free?

星座早見 / Planisphere is free to download, with no in-app purchases.

### Is Sky Academy free?

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

### Which has better reviews, 星座早見 / Planisphere or Sky Academy?

Sky Academy is rated higher. 星座早見 / Planisphere averages 1.0 out of 5 from 1 ratings, while Sky Academy averages 4.9 from 197 ratings.

### Do 星座早見 / Planisphere or Sky Academy have ads?

Neither 星座早見 / Planisphere nor Sky Academy shows ads.

### Which is updated more often, 星座早見 / Planisphere or Sky Academy?

星座早見 / Planisphere ships an update every 5 weeks, and Sky Academy every 4 months. Most recently, 星座早見 / Planisphere was updated on October 24, 2026 and Sky Academy on October 24, 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.*