# 年号電卓Plus vs 江戸ものさし

The clearest difference is ads: 年号電卓Plus at none against 江戸ものさし's shown. On price, update cadence, 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.

Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on July 27, 2026 and May 19, 2026 respectively.

## The numbers

| Metric | 年号電卓Plus | 江戸ものさし |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Monetization | Free | — |
| Size | 7 MB | 7 MB |
| Requires iOS | 17.6 | **17.1** |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nakanishi Toshihiko](https://appshunter.io/developer/712843914) | [Yusuke Kiyoi](https://appshunter.io/developer/1670887880) |

## 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


### 江戸ものさし

[App page](https://appshunter.io/ios/app/id6742149184)

**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 江戸ものさし free?

江戸ものさし is free to download, with no in-app purchases.

### Do 年号電卓Plus or 江戸ものさし have ads?

江戸ものさし shows ads; 年号電卓Plus does not.

### Which is updated more often, 年号電卓Plus or 江戸ものさし?

年号電卓Plus ships an update every 6 weeks, and 江戸ものさし every 6 weeks. Most recently, 年号電卓Plus was updated on July 27, 2026 and 江戸ものさし on May 19, 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.*