# Gengou Lib vs 素因数分解計算機アプリ

The clearest difference is price: Gengou Lib at Free against 素因数分解計算機アプリ's $0.49. 素因数分解計算機アプリ's advantage is ads (none vs shown) and update cadence (daily vs every 61 months). On in-app purchases, device support and iOS requirement there is nothing between them.

Gengou Lib is free to download; 素因数分解計算機アプリ costs $0.49 up front. Neither carries in-app purchases, so what you see is what you pay.

Gengou Lib ships an update every 61 months, 素因数分解計算機アプリ daily. The most recent releases landed on October 14, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Gengou Lib | 素因数分解計算機アプリ |
| --- | --- | --- |
| Price | **Free** | $0.49 |
| Rating | **[2.5 (2 ratings)](https://appshunter.io/ios/app/gengou-lib/id284830543/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 84.5% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 61 months | **Daily** |
| Monetization | Free | — |
| Size | 6 MB | 22 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Masayuki Akamatsu](https://appshunter.io/developer/284722836) | [kotobaz](https://appshunter.io/developer/1634727152) |

## What reviewers say

### Gengou Lib

[App page](https://appshunter.io/ios/app/gengou-lib/id284830543)

Quickly convert between Japanese era names and Christian era years. Features include era and year searching, period and era pickers, and the ability to display the current year in either system. Texts can be shown in Japanese or English.

**Highlights:** Era and year search, Period picker, Era picker, Christian era year picker, Japanese era year picker, Show this year button, Multi-language text display

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

**In-app purchases:** none


### 素因数分解計算機アプリ

[App page](https://appshunter.io/ios/app/soin/id6502540829)

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

**In-app purchases:** none


## Frequently asked questions

### Is Gengou Lib free?

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

### Is 素因数分解計算機アプリ free?

素因数分解計算機アプリ costs $0.49, with no in-app purchases.

### Do Gengou Lib or 素因数分解計算機アプリ have ads?

Gengou Lib shows ads; 素因数分解計算機アプリ does not.

### Which is updated more often, Gengou Lib or 素因数分解計算機アプリ?

Gengou Lib ships an update every 61 months, and 素因数分解計算機アプリ daily. Most recently, Gengou Lib was updated on October 14, 2026 and 素因数分解計算機アプリ 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.*