# ProbabilityPlayer vs Calculus Gacha！

The clearest difference is update cadence: Calculus Gacha！ at every 2 days against ProbabilityPlayer's monthly. Calculus Gacha！ also leads on iOS requirement (13.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. ProbabilityPlayer sells 1 one-off in-app purchase and Calculus Gacha！ sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ProbabilityPlayer ships an update monthly, Calculus Gacha！ every 2 days. The most recent releases landed on September 27, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | ProbabilityPlayer | Calculus Gacha！ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 9 MB | 81 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Motonari Hibi](https://appshunter.io/developer/386737172) | [Shunsuke Nakamura](https://appshunter.io/developer/1828229182) |

## What reviewers say

### ProbabilityPlayer

[App page](https://appshunter.io/ios/app/probabilityplayer/id6737689746)

Practice probability problems for the Kyotsu Test, a common Japanese university entrance exam. This app focuses on mathematical probability questions and includes diagrams to aid understanding. It is designed to help students prepare for this specific academic assessment.

**Highlights:** Probability problem practice, Kyotsu Test focus, Mathematical probability, Diagrams included, University entrance exam prep

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | one-time |


### 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 ProbabilityPlayer free?

ProbabilityPlayer 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 ProbabilityPlayer or Calculus Gacha！ have ads?

Neither ProbabilityPlayer nor Calculus Gacha！ shows ads.

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

ProbabilityPlayer ships an update monthly, and Calculus Gacha！ every 2 days. Most recently, ProbabilityPlayer was updated on September 27, 2026 and Calculus Gacha！ on September 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.*