# びっくりアプリ vs PrimeFactorizationGame

The clearest difference is price: PrimeFactorizationGame at Free against びっくりアプリ's $1.99. PrimeFactorizationGame also leads on update cadence (monthly vs every 4 months). びっくりアプリ's advantage is iOS requirement (14.2 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

PrimeFactorizationGame is free to download; びっくりアプリ costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

びっくりアプリ ships an update every 4 months, PrimeFactorizationGame monthly. The most recent releases landed on June 19, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | びっくりアプリ | PrimeFactorizationGame |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/id1508282901/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Monthly** |
| Size | 20 MB | 7 MB |
| Requires iOS | **14.2** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Yusaku Fujita](https://appshunter.io/developer/1506740830) | [TomatoAppLab](https://appshunter.io/developer/1676711750) |

## What reviewers say

### びっくりアプリ

[App page](https://appshunter.io/ios/app/id1508282901)

**Features:** macOS Compatibility

**In-app purchases:** none


### PrimeFactorizationGame

[App page](https://appshunter.io/ios/app/primefactorizationgame/id6755812213)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is びっくりアプリ free?

びっくりアプリ costs $1.99, with no in-app purchases.

### Is PrimeFactorizationGame free?

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

### Do びっくりアプリ or PrimeFactorizationGame have ads?

Both びっくりアプリ and PrimeFactorizationGame show ads.

### Which is updated more often, びっくりアプリ or PrimeFactorizationGame?

びっくりアプリ ships an update every 4 months, and PrimeFactorizationGame monthly. Most recently, びっくりアプリ was updated on June 19, 2026 and PrimeFactorizationGame on September 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*