# ProbabilityPlayer vs 暗算Blitz

The clearest difference is ads: ProbabilityPlayer at none against 暗算Blitz's shown. 暗算Blitz's advantage is update cadence (daily vs monthly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. ProbabilityPlayer sells 1 one-off in-app purchase and 暗算Blitz sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ProbabilityPlayer ships an update monthly, 暗算Blitz daily. The most recent releases landed on October 13, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | ProbabilityPlayer | 暗算Blitz |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 9 MB | 54 MB |
| Requires iOS | 18.0 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Motonari Hibi](https://appshunter.io/developer/386737172) | [Toshihide KAWAI](https://appshunter.io/developer/1598098272) |

## 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 |


### 暗算Blitz

[App page](https://appshunter.io/ios/app/blitz/id6741730652)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム・ユーザー | $14.99 | one-time |


## Frequently asked questions

### Is ProbabilityPlayer free?

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

### Is 暗算Blitz free?

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

### Do ProbabilityPlayer or 暗算Blitz have ads?

暗算Blitz shows ads; ProbabilityPlayer does not.

### Which is updated more often, ProbabilityPlayer or 暗算Blitz?

ProbabilityPlayer ships an update monthly, and 暗算Blitz daily. Most recently, ProbabilityPlayer was updated on October 13, 2026 and 暗算Blitz on October 20, 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.*