# ProbabilityPlayer vs UTokyo One

The clearest difference is in-app purchases: UTokyo One at none against ProbabilityPlayer's 1. UTokyo One also leads on iOS requirement (15.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ProbabilityPlayer sells 1 one-off in-app purchase. UTokyo One asks for nothing beyond the download.

ProbabilityPlayer ships an update monthly, UTokyo One every 5 weeks. The most recent releases landed on September 27, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | ProbabilityPlayer | UTokyo One |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 9 MB | 90 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Motonari Hibi](https://appshunter.io/developer/386737172) | [The University of Tokyo](https://appshunter.io/developer/420876276) |

## 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 |


### UTokyo One

[App page](https://appshunter.io/ios/app/utokyo-one/id6760084159)

**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 UTokyo One free?

UTokyo One is free to download, with no in-app purchases.

### Do ProbabilityPlayer or UTokyo One have ads?

Neither ProbabilityPlayer nor UTokyo One shows ads.

### Which is updated more often, ProbabilityPlayer or UTokyo One?

ProbabilityPlayer ships an update monthly, and UTokyo One every 5 weeks. Most recently, ProbabilityPlayer was updated on September 27, 2026 and UTokyo One on October 9, 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.*