# Prime Factorization vs Flash Anzan

The clearest difference is in-app purchases: Prime Factorization at none against Flash Anzan's 1. Prime Factorization also leads on ads (none vs shown) and update cadence (every 6 weeks vs every 3 months). On price and device support there is nothing between them.

Both are free to download. Flash Anzan sells 1 one-off in-app purchase. Prime Factorization asks for nothing beyond the download.

Prime Factorization ships an update every 6 weeks, Flash Anzan every 3 months. The most recent releases landed on November 2, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Prime Factorization | Flash Anzan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (4 ratings)](https://appshunter.io/ios/app/prime-factorization-free-brain-training-game/id1062168263/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 22 MB | 50 MB |
| Requires iOS | **7.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NAKAYUBI CORPORATION](https://appshunter.io/developer/826300169) | [tomople](https://appshunter.io/developer/1384257281) |

## What reviewers say

### Prime Factorization

[App page](https://appshunter.io/ios/app/prime-factorization-free-brain-training-game/id1062168263)

This game challenges you to break down numbers into their prime factors until you reach one. It offers a simple yet engaging way to exercise your brain through number manipulation.

**Highlights:** Number factorization gameplay, Objective: reduce number to 1, Brain training exercises, Simple mechanics

**Features:** macOS Compatibility

**In-app purchases:** none


### Flash Anzan

[App page](https://appshunter.io/ios/app/flash-anzan-soroban-math/id6477599363)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is Prime Factorization free?

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

### Is Flash Anzan free?

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

### Do Prime Factorization or Flash Anzan have ads?

Flash Anzan shows ads; Prime Factorization does not.

### Which is updated more often, Prime Factorization or Flash Anzan?

Prime Factorization ships an update every 6 weeks, and Flash Anzan every 3 months. Most recently, Prime Factorization was updated on November 2, 2026 and Flash Anzan on November 8, 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.*