# A vs Calculus Gacha！

The clearest difference is update cadence: Calculus Gacha！ at every 3 days against A's every 2 weeks. Calculus Gacha！ also leads on iOS requirement (15.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. A sells 1 one-off in-app purchase and Calculus Gacha！ sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

A ships an update every 2 weeks, Calculus Gacha！ every 3 days. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | A | Calculus Gacha！ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Size | 271 MB | 83 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ogumo Co., Ltd.](https://appshunter.io/developer/1289277557) | [Shunsuke Nakamura](https://appshunter.io/developer/1828229182) |

## What reviewers say

### A

[App page](https://appshunter.io/ios/app/a-physics-mechanics/id6670272249)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide ads | $5.99 | one-time |


### Calculus Gacha！

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

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 不定方程式ガチャ利用オプション | $0.99 | one-time |
| AI Tutor Pass | $2.99 | 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 A free?

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

### Is Calculus Gacha！ free?

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

### Do A or Calculus Gacha！ have ads?

Neither A nor Calculus Gacha！ shows ads.

### Which is updated more often, A or Calculus Gacha！?

A ships an update every 2 weeks, and Calculus Gacha！ every 3 days. Most recently, A was updated on October 27, 2026 and Calculus Gacha！ on October 30, 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.*