# 年号電卓Plus vs 和暦ウォッチ

The clearest difference is update cadence: 和暦ウォッチ at every 4 days against 年号電卓Plus's every 6 weeks. 和暦ウォッチ also leads on iOS requirement (13.0 vs 17.6). On price, ads, in-app purchases and device support 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, 和暦ウォッチ every 4 days. The most recent releases landed on July 27, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | 年号電卓Plus | 和暦ウォッチ |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 4 days** |
| Monetization | Free | — |
| Size | 7 MB | 3 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Nakanishi Toshihiko](https://appshunter.io/developer/712843914) | [Yutaro Yoshizawa](https://appshunter.io/developer/1528001085) |

## 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


### 和暦ウォッチ

[App page](https://appshunter.io/ios/app/id6739359101)

**Features:** Apple Watch app

**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 和暦ウォッチ free?

和暦ウォッチ is free to download, with no in-app purchases.

### Do 年号電卓Plus or 和暦ウォッチ have ads?

Neither 年号電卓Plus nor 和暦ウォッチ shows ads.

### Which is updated more often, 年号電卓Plus or 和暦ウォッチ?

年号電卓Plus ships an update every 6 weeks, and 和暦ウォッチ every 4 days. Most recently, 年号電卓Plus was updated on July 27, 2026 and 和暦ウォッチ on September 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*