# あかほん！ プロトタイプA vs Calculus Gacha！

The clearest difference is in-app purchases: あかほん！ プロトタイプA at none against Calculus Gacha！'s 3. あかほん！ プロトタイプA also leads on iOS requirement (7.0 vs 15.0). Calculus Gacha！'s advantage is update cadence (every 3 days vs every 4 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Calculus Gacha！ sells 3 one-off in-app purchases. あかほん！ プロトタイプA asks for nothing beyond the download.

あかほん！ プロトタイプA ships an update every 4 weeks, Calculus Gacha！ every 3 days. The most recent releases landed on October 8, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | あかほん！ プロトタイプA | Calculus Gacha！ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/a/id1438322285/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 3 days** |
| Monetization | Free | — |
| Size | 88 MB | 83 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nobumitsu Shikine](https://appshunter.io/developer/1361521847) | [Shunsuke Nakamura](https://appshunter.io/developer/1828229182) |

## What reviewers say

### あかほん！ プロトタイプA

[App page](https://appshunter.io/ios/app/a/id1438322285)

This app uses a unique story-driven approach to help users learn calculus concepts like differentiation. Follow characters through engaging dialogues that explain complex math topics at your own pace.

**Highlights:** Story-driven learning, Interactive dialogues, Calculus concepts (differentiation), Character-based guidance, NOVELICA system, Self-paced learning

**Features:** macOS Compatibility

**In-app purchases:** none


### Calculus Gacha！

[App page](https://appshunter.io/ios/app/calculus-gacha/id6753078774)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 不定方程式ガチャ利用オプション | $0.99 | one-time |
| AI Tutor Plus(500) | $2.99 | one-time |
| 履歴管理機能オプション | $2.99 | one-time |


## Frequently asked questions

### Is あかほん！ プロトタイプA free?

あかほん！ プロトタイプA is free to download, with no in-app purchases.

### Is Calculus Gacha！ free?

Calculus Gacha！ is free to download, with in-app purchases available.

### Do あかほん！ プロトタイプA or Calculus Gacha！ have ads?

Neither あかほん！ プロトタイプA nor Calculus Gacha！ shows ads.

### Which is updated more often, あかほん！ プロトタイプA or Calculus Gacha！?

あかほん！ プロトタイプA ships an update every 4 weeks, and Calculus Gacha！ every 3 days. Most recently, あかほん！ プロトタイプA was updated on October 8, 2026 and Calculus Gacha！ on October 11, 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.*