# 年号電卓Plus vs 西暦和暦変換器

The clearest difference is iOS requirement: 年号電卓Plus at 17.6 against 西暦和暦変換器's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

年号電卓Plus ships an update every 6 weeks, 西暦和暦変換器 every 3 weeks. The most recent releases landed on July 27, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | 年号電卓Plus | 西暦和暦変換器 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 7 MB | 3 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nakanishi Toshihiko](https://appshunter.io/developer/712843914) | [Daisuke Minami](https://appshunter.io/developer/1762826742) |

## What reviewers say

### 年号電卓Plus

[App page](https://appshunter.io/ios/app/plus/id1320583340)

Easily convert between Western and Japanese eras, and determine birth years from age. Explore historical context with explanations for era changes and significant events of each year.

**Highlights:** Western to Japanese era conversion, Japanese era to Western conversion, Calculate birth year from age, View era start and end dates, Understand reasons for era changes, Discover major events of each year

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### 西暦和暦変換器

[App page](https://appshunter.io/ios/app/id6711329947)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 年号電卓Plus free?

年号電卓Plus is free to download, with no in-app purchases.

### Is 西暦和暦変換器 free?

西暦和暦変換器 is free to download, with no in-app purchases.

### Do 年号電卓Plus or 西暦和暦変換器 have ads?

Neither 年号電卓Plus nor 西暦和暦変換器 shows ads.

### Which is updated more often, 年号電卓Plus or 西暦和暦変換器?

年号電卓Plus ships an update every 6 weeks, and 西暦和暦変換器 every 3 weeks. Most recently, 年号電卓Plus was updated on July 27, 2026 and 西暦和暦変換器 on September 18, 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.*