# Gengou Lib vs 干支計算電卓アプリ

The clearest difference is price: Gengou Lib at Free against 干支計算電卓アプリ's $0.49. 干支計算電卓アプリ's advantage is ads (none vs shown) and update cadence (every 18 months vs every 61 months). On in-app purchases, device support and iOS requirement there is nothing between them.

Gengou Lib is free to download; 干支計算電卓アプリ 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, 干支計算電卓アプリ every 18 months. The most recent releases landed on October 14, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Gengou Lib | 干支計算電卓アプリ |
| --- | --- | --- |
| 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 | **Every 18 months** |
| Monetization | Free | — |
| Size | 6 MB | 16 MB |
| Requires iOS | 13.0 | 13.0 |
| 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


### 干支計算電卓アプリ

[App page](https://appshunter.io/ios/app/etocalc/id6502873595)

**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 干支計算電卓アプリ free?

干支計算電卓アプリ costs $0.49, with no in-app purchases.

### Do Gengou Lib or 干支計算電卓アプリ have ads?

Gengou Lib shows ads; 干支計算電卓アプリ does not.

### Which is updated more often, Gengou Lib or 干支計算電卓アプリ?

Gengou Lib ships an update every 61 months, and 干支計算電卓アプリ every 18 months. Most recently, Gengou Lib was updated on October 14, 2026 and 干支計算電卓アプリ on September 22, 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.*