# Alien Planets vs 天文宇宙検定1級 過去問・暗記アプリ

The clearest difference is price: 天文宇宙検定1級 過去問・暗記アプリ at Free against Alien Planets's $9.99. 天文宇宙検定1級 過去問・暗記アプリ also leads on update cadence (fortnightly vs every 27 months). Alien Planets's advantage is in-app purchases (none vs 3) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

天文宇宙検定1級 過去問・暗記アプリ is free to download; Alien Planets costs $9.99 up front. 天文宇宙検定1級 過去問・暗記アプリ sells 3 one-off in-app purchases. Alien Planets asks for nothing beyond the download.

Alien Planets ships an update every 27 months, 天文宇宙検定1級 過去問・暗記アプリ fortnightly. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Alien Planets | 天文宇宙検定1級 過去問・暗記アプリ |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 27 months | **Fortnightly** |
| Size | 34 MB | 42 MB |
| Requires iOS | 18.2 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jose Leal](https://appshunter.io/developer/1441468562) | [Hajime App Lab](https://appshunter.io/developer/1704838092) |

## What reviewers say

### Alien Planets

[App page](https://appshunter.io/ios/app/alien-planets/id1478121868)

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

**In-app purchases:** none


### 天文宇宙検定1級 過去問・暗記アプリ

[App page](https://appshunter.io/ios/app/1/id6784950185)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告削除 | $3.99 | one-time |
| 全問題解放 | $3.99 | one-time |
| 広告削除+全問題解放 | $5.99 | one-time |


## Frequently asked questions

### Is Alien Planets free?

Alien Planets costs $9.99, with no in-app purchases.

### Is 天文宇宙検定1級 過去問・暗記アプリ free?

天文宇宙検定1級 過去問・暗記アプリ is free to download, with in-app purchases available.

### Do Alien Planets or 天文宇宙検定1級 過去問・暗記アプリ have ads?

天文宇宙検定1級 過去問・暗記アプリ shows ads; Alien Planets does not.

### Which is updated more often, Alien Planets or 天文宇宙検定1級 過去問・暗記アプリ?

Alien Planets ships an update every 27 months, and 天文宇宙検定1級 過去問・暗記アプリ fortnightly. Most recently, Alien Planets was updated on October 3, 2026 and 天文宇宙検定1級 過去問・暗記アプリ on October 6, 2026.

---

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