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

- 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.

What’s New

Version 2.1.0

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

Ratings and Reviews

3.8 out of 5
4 Ratings

4 Ratings

Xanduur ,

Needs update

I have used the app for a few years, but if it isn't updated to 64-bit the app is basically useless.

scottyo3921 ,

I like it, but there’s a problem

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.

presumed air ,

Nifty converter

Simple app does exactly what it's supposed to do, conveniently... but needs an overdue compatibility update to continue being supported in future releases of iOS.


正行 Akamatsu
15 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Japanese

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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