# CoTan vs 高校地学マスター

The clearest difference is iOS requirement: CoTan at 15.1 against 高校地学マスター's 26.2. 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.

CoTan ships an update every 3 days, 高校地学マスター every 2 days. The most recent releases landed on October 12, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | CoTan | 高校地学マスター |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 3 days | **Every 2 days** |
| Size | 28 MB | 12 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ryo Minebayashi](https://appshunter.io/developer/1854415357) | [Hirokazu Kurokawa](https://appshunter.io/developer/463196366) |

## What reviewers say

### CoTan

[App page](https://appshunter.io/ios/app/cotan/id6755531559)

**Features:** macOS Compatibility

**In-app purchases:** none


### 高校地学マスター

[App page](https://appshunter.io/ios/app/id6808630906)

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

**In-app purchases:** none


## Frequently asked questions

### Is CoTan free?

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

### Is 高校地学マスター free?

高校地学マスター is free to download, with no in-app purchases.

### Do CoTan or 高校地学マスター have ads?

Both CoTan and 高校地学マスター show ads.

### Which is updated more often, CoTan or 高校地学マスター?

CoTan ships an update every 3 days, and 高校地学マスター every 2 days. Most recently, CoTan was updated on October 12, 2026 and 高校地学マスター on October 9, 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.*