# 瞬間素因数分解 Prime Factorization vs PFD Calc

The clearest difference is in-app purchases: PFD Calc at none against 瞬間素因数分解 Prime Factorization's 1. PFD Calc also leads on iOS requirement (15.0 vs 17.0). 瞬間素因数分解 Prime Factorization's advantage is update cadence (weekly vs every 5 weeks). On price, ads and device support there is nothing between them.

Both are free to download. 瞬間素因数分解 Prime Factorization sells 1 one-off in-app purchase. PFD Calc asks for nothing beyond the download.

瞬間素因数分解 Prime Factorization ships an update weekly, PFD Calc every 5 weeks. The most recent releases landed on September 21, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | 瞬間素因数分解 Prime Factorization | PFD Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Weekly** | Every 5 weeks |
| Size | 3 MB | 14 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [YUSUKE MIZUNO](https://appshunter.io/developer/1729948508) | [Kazuhisa Kobayashi](https://appshunter.io/developer/1580882000) |

## What reviewers say

### 瞬間素因数分解 Prime Factorization

[App page](https://appshunter.io/ios/app/prime-factorization/id6478605149)

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

**In-app purchases (1)**

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


### PFD Calc

[App page](https://appshunter.io/ios/app/pfd-calc-prime-factorization/id6737405828)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 瞬間素因数分解 Prime Factorization free?

瞬間素因数分解 Prime Factorization is free to download, with in-app purchases available.

### Is PFD Calc free?

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

### Do 瞬間素因数分解 Prime Factorization or PFD Calc have ads?

Both 瞬間素因数分解 Prime Factorization and PFD Calc show ads.

### Which is updated more often, 瞬間素因数分解 Prime Factorization or PFD Calc?

瞬間素因数分解 Prime Factorization ships an update weekly, and PFD Calc every 5 weeks. Most recently, 瞬間素因数分解 Prime Factorization was updated on September 21, 2026 and PFD Calc on September 17, 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.*