# ProbabilityPlayer vs 不定方程式ガチャ

The clearest difference is price: ProbabilityPlayer at Free against 不定方程式ガチャ's $3.99. 不定方程式ガチャ's advantage is in-app purchases (none vs 1) and update cadence (every 11 days vs monthly). On ads, device support and iOS requirement there is nothing between them.

ProbabilityPlayer is free to download; 不定方程式ガチャ costs $3.99 up front. ProbabilityPlayer sells 1 one-off in-app purchase. 不定方程式ガチャ asks for nothing beyond the download.

ProbabilityPlayer ships an update monthly, 不定方程式ガチャ every 11 days. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | ProbabilityPlayer | 不定方程式ガチャ |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 11 days** |
| Monetization | Free with in-app purchases | — |
| Size | 9 MB | 11 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Motonari Hibi](https://appshunter.io/developer/386737172) | [Akira Hiraoka](https://appshunter.io/developer/1668714727) |

## 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 |


### 不定方程式ガチャ

[App page](https://appshunter.io/ios/app/id6757098537)

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

**In-app purchases:** none


## Frequently asked questions

### Is ProbabilityPlayer free?

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

### Is 不定方程式ガチャ free?

不定方程式ガチャ costs $3.99, with no in-app purchases.

### Do ProbabilityPlayer or 不定方程式ガチャ have ads?

Neither ProbabilityPlayer nor 不定方程式ガチャ shows ads.

### Which is updated more often, ProbabilityPlayer or 不定方程式ガチャ?

ProbabilityPlayer ships an update monthly, and 不定方程式ガチャ every 11 days. Most recently, ProbabilityPlayer was updated on November 4, 2026 and 不定方程式ガチャ on November 5, 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.*