# Gengou — Japanese Era Pickers

> Converts Japanese era names and years to Christian era equivalents. (iPhone/iPad app by Masayuki Akamatsu.)

- Source: https://appshunter.io/ios/app/gengou/id288968943 (this page in markdown: same URL + `.md`)
- Developer: [Masayuki Akamatsu](https://appshunter.io/developer/284722836)
- Category: Productivity, Utilities
- Price: $0.99
- Rating: 3.80/5 from 4 App Store ratings · 56 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 3 MB
- Languages: American English, Japanese
- Released: 2019-02-12
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/gengou/id288968943/reviews.md

## What is Gengou?

"Gengou" is a quick reference of the Japanese era system. This application has functions as below.

- Era and Year Search
- Period picker
- Era picker
- Christian era year picker
- Japanese era year picker
- Show this year button 
- Texts can be shown in Japanese or English independently of the default language setting.
- Application badge can show this year number in the Japanese era or the Christian era.

The Japanese era system identifies a year by the combination of the era name (Gengou or Nengou) and the year number within the era. For example, A.D. 2001 is Heisei 13. Please note that two Gengou schemes were used in Parallel from 1331 to 1392 during Nanboku-chō period. 

This application would be very useful if you are working with the governments, municipal offices and/or certain companies in Japan.

## Key features

- Era and Year Search
- Period Picker
- Era Picker
- Christian Era Year Picker
- Japanese Era Year Picker
- Show This Year Button
- Dual Language Support (JP/EN)

## Recent user reviews (10 of 56)

All indexed reviews: https://appshunter.io/ios/app/gengou/id288968943/reviews.md

### 5/5 — 元号の面倒を解決

*2026-07-06*

まだまだ元号を使われることがなくならないので、西暦で認識しているわたしにはかかせないappである。
歴史にまつわる書物を読むときにもかかせない。
元号の順番を覚え、元号の使用された年数を覚え、これらを暗算することを楽しめない方々にお勧めだ。

### 2/5 — 元号の継ぎ目の月日が無くなった

*2019-11-22*

前は元号の継ぎ目に
〜月，日／月，日〜
が表示されてたのになぜ無くなったのか・・・

### 5/5 — 新元号【令和】への対応ありがとうございました

*2019-04-05*

※追記
早速の新元号【令和】への対応ありがとうございました！さすがです。素晴らしい。

大変便利に使っています。
西暦⇔和暦の変換はもちろん『今から何年前？』を調べたいときにも重宝しています。
これからも長く使い続けたいアプリです。

### 5/5 — 新元号「令和」に対応！

*2019-04-02*

便利なのでiOS11になっても使えるようにして欲しいです。

2019.04.02
便利に使ってます。それにしても、新元号の対応早ッ！

### 3/5 — 誤記

*2019-04-02*

新元号への素早い対応には感心。しかし、巳年の「巳」が「己」になってるのは直せないんですかね？ 気になってしょうがないんですが。それさえ直れば★5なのに。

### 5/5 — 迅速な対応、感謝

*2019-04-02*

新元号「令和」に迅速に対応していただき、ありがとうございます。
引き続き愛用させていただきます。

### 2/5 — I like it, but there’s a problem

*2018-05-15*

I believe this is the same app I had a few years ago when it was free, and I liked it then.
I still like it, but there’s a UI problem. 
On my iPhone 8 running the latest version of iOS, when I try to tap the settings button, it just scrolls the year. It looks like the year scroller overlaps the settings button and is on top of it.
When this is fixed I will like this app very much.

### 4/5 — ボタンが押せません

*2018-01-15*

iPhone SEを使用しています。
画面下の「設定」と「今年」が押せません。

### 4/5 — バッジが表示されない

*2018-01-05*

バッジの非表示に気付き今年になって初めて起動したのですが、下側左右の「設定」と「今年」が反応しません。タップすると下の元号や西暦のダイヤルが回転してしまいます。
表題のバッジ非表示の件は、iPhoneの設定の通知を確認しましたがバッジはオンになってました。対応願います。端末はiPhone5sです。

### 2/5 — 使いにくくなった。

*2018-01-01*

64ビット対応したは良いが、設定などは表示されているだけで押せないし、画面のレイアウトも以前の方が使い易かった。
あまり以前のように使いたいという気持ちにさせてくれないレイアウトだし間抜けな感じを感じさせるアプリになってしまいました。
取り急ぎ64ビット対応したって感じなのできっちりと作り込んで欲しいです。かなりメンテもされていませんでしたし。

## Frequently asked questions about Gengou

### What is Gengou?

Gengou is a quick reference application for the Japanese era system. It allows users to easily convert between Japanese era names and Christian era years, and vice versa.

### How does Gengou handle the Nanboku-chō period?

The application notes that two Gengou schemes were used in parallel from 1331 to 1392 during the Nanboku-chō period, indicating awareness of historical complexities.

### Can I use Gengou in Japanese?

Yes, texts within the application can be shown in Japanese or English independently of your device's default language setting.

### What devices does Gengou support?

Gengou is available for iPhone, iPad, and iPod devices.

### How often is Gengou updated?

The latest version, 3.0.0, was last updated on August 26, 2025. This indicates a recent update, suggesting ongoing support.

### What is the age rating for Gengou?

Gengou has an age rating of 4+, making it suitable for a wide range of users.

### Does Gengou have ads?

No, Gengou does not contain advertisements. It is a paid application without any ad interruptions.

### What is the price of Gengou?

Gengou is available for a one-time purchase of $0.99.

## Version history (last 5 releases)

### 3.0.1 — 2026-07-04

Minor bugs have been fixed.

### 3.0.0 — 2025-08-26

■ Quick Search for Japanese Eras
  Find any era instantly! Search by hiragana (しょうわ),
  romaji (showa), or kanji (昭和) - all input methods work!
  Supports partial matching and year-based search.

■ Dark Mode Support
  Easy on the eyes for comfortable nighttime use.

■ Other Improvements
  Enhanced search performance and bug fixes.

### 2.1.0 — 2019-04-02

Supports the new era "令和 (Reiwa)"
Source: "初春令月氣淑風和" from Man'yōshū
Reference: "仲春令月時和気清" from Wen Xuan

### 2.0.0 — 2017-09-21

- Works with iOS 10 and later.
- User Interface refined.

### 1.2.0 — 2012-03-02

- Shows the number of this year as an application badge.
- Shows texts with your preferred language (English/Japanese) independently of the default language setting.
- Supports the high resolution display (Retina display).
- Fixed a bug on the Japanese Calendar in the Settings.

## Apps similar to Gengou

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Japanese Era Converter (JEras)](https://appshunter.io/ios/app/japanese-era-converter-jeras/id1559193412) | — | Free | Productivity |
| [ときメモ - 時間記録 /  作業記録 / 作業管理](https://appshunter.io/ios/app/id6478070261) | — | Free | Productivity |
| [Houji](https://appshunter.io/ios/app/houji/id482918299) | — | $1.99 | Productivity |
| [Fast Memo](https://appshunter.io/ios/app/fast-memo/id323208864) | 5.0 (1) | $0.99 | Productivity |
| [Japanese Calendar Converter](https://appshunter.io/ios/app/japanese-calendar-converter/id1460550714) | 4.5 (2) | Free | Productivity |
| [simpleCal - Widget Calendar](https://appshunter.io/ios/app/simplecal-widget-calendar/id6502568333) | — | $0.49 | Productivity |

## More apps by Masayuki Akamatsu

- [Yes\|No Free](https://appshunter.io/ios/app/yesno-free/id284722833)
- [Alarm Free](https://appshunter.io/ios/app/alarm-free/id284728433)
- [Compass Free](https://appshunter.io/ios/app/compass-free/id284735786)
- [picocalc](https://appshunter.io/ios/app/picocalc/id284740333)
- [Gengou Lib](https://appshunter.io/ios/app/gengou-lib/id284830543)
- [T4Two](https://appshunter.io/ios/app/t4two/id284910005)

All apps by Masayuki Akamatsu: https://appshunter.io/developer/284722836

## Related topics

[gengou](https://appshunter.io/ios/topics/gengou)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*