# Gengou Lib vs 元号変換

The clearest difference is review sentiment: Gengou Lib at 84% against 元号変換's 33%. 元号変換's advantage is ads (none vs shown) and update cadence (every 9 months vs every 61 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Gengou Lib ships an update every 61 months, 元号変換 every 9 months. The most recent releases landed on October 14, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Gengou Lib | 元号変換 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (2 ratings)](https://appshunter.io/ios/app/gengou-lib/id284830543/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **84.5% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 61 months | **Every 9 months** |
| Monetization | Free | — |
| Size | 6 MB | 8 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Masayuki Akamatsu](https://appshunter.io/developer/284722836) | [Seiji Nagano](https://appshunter.io/developer/689628441) |

## 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


### 元号変換

[App page](https://appshunter.io/ios/app/id736769268)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Gengou Lib free?

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

### Is 元号変換 free?

元号変換 is free to download, with no in-app purchases.

### Do Gengou Lib or 元号変換 have ads?

Gengou Lib shows ads; 元号変換 does not.

### Which is updated more often, Gengou Lib or 元号変換?

Gengou Lib ships an update every 61 months, and 元号変換 every 9 months. Most recently, Gengou Lib was updated on October 14, 2026 and 元号変換 on October 13, 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.*