# 地学の王様 vs 和暦checker

The clearest difference is update cadence: 和暦checker at every 4 days against 地学の王様's every 2 months. 地学の王様's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 地学の王様 sells 3 in-app purchases, starting at $3.49 per month and 和暦checker sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

地学の王様 ships an update every 2 months, 和暦checker every 4 days. The most recent releases landed on November 11, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | 地学の王様 | 和暦checker |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 75.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 109 MB | 5 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [HANAUTA INC.](https://appshunter.io/developer/492009717) | [Kosuke Mawatari](https://appshunter.io/developer/1489564137) |

## What reviewers say

### 地学の王様

[App page](https://appshunter.io/ios/app/id1591156767)

Study geoscience through fun, quiz-like questions. This app offers over 3000 questions in various formats, ideal for quick learning sessions and exam preparation. It gamifies the learning process with stages and rewards.

**Highlights:** Over 3000 geoscience questions, Quiz-like learning format, Suitable for regular and entrance exams, Gamified progress with stages and rewards, Short play sessions for flexible study

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 特訓プラン | $3.49 | per month |
| 特訓プラン | $16.49 | per 6 months |
| 特訓プラン | $26.49 | per year |


### 和暦checker

[App page](https://appshunter.io/ios/app/checker/id6821827275)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 広告を消す | $2.99 | one-time |


## Frequently asked questions

### Is 地学の王様 free?

地学の王様 is free to download, with in-app purchases available.

### Is 和暦checker free?

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

### Do 地学の王様 or 和暦checker have ads?

Both 地学の王様 and 和暦checker show ads.

### Which is updated more often, 地学の王様 or 和暦checker?

地学の王様 ships an update every 2 months, and 和暦checker every 4 days. Most recently, 地学の王様 was updated on November 11, 2026 and 和暦checker on November 6, 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.*