# Calculus Gacha！ vs Euclid Lab

The clearest difference is in-app purchases: Euclid Lab at none against Calculus Gacha！'s 4. Calculus Gacha！'s advantage is iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Calculus Gacha！ sells 4 one-off in-app purchases. Euclid Lab asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Calculus Gacha！ | Euclid Lab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 days | Every 3 days |
| Size | 83 MB | 14 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Shunsuke Nakamura](https://appshunter.io/developer/1828229182) | [Yung-Hsin Shieh](https://appshunter.io/developer/6794223212) |

## What reviewers say

### 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 |


### Euclid Lab

[App page](https://appshunter.io/ios/app/euclid-lab/id6801162141)

**Features:** Family Sharing, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Calculus Gacha！ free?

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

### Is Euclid Lab free?

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

### Do Calculus Gacha！ or Euclid Lab have ads?

Neither Calculus Gacha！ nor Euclid Lab shows ads.

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

Calculus Gacha！ ships an update every 3 days, and Euclid Lab every 3 days. Most recently, Calculus Gacha！ was updated on October 24, 2026 and Euclid Lab on October 25, 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.*