# 年号電卓Plus vs Annual Memo

The clearest difference is in-app purchases: 年号電卓Plus at none against Annual Memo's 1. 年号電卓Plus also leads on ads (none vs shown). Annual Memo's advantage is iOS requirement (14.0 vs 17.6). On price, update cadence and device support there is nothing between them.

Both are free to download. Annual Memo sells 1 one-off in-app purchase. 年号電卓Plus asks for nothing beyond the download.

年号電卓Plus ships an update every 6 weeks, Annual Memo every 5 weeks. The most recent releases landed on July 27, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | 年号電卓Plus | Annual Memo |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 5 weeks** |
| Monetization | Free | — |
| Size | 7 MB | 9 MB |
| Requires iOS | 17.6 | **14.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nakanishi Toshihiko](https://appshunter.io/developer/712843914) | [Mihoko Araki](https://appshunter.io/developer/1476136915) |

## 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


### Annual Memo

[App page](https://appshunter.io/ios/app/annual-memo/id1612023919)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Feature | $1.99 | one-time |


## 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 Annual Memo free?

Annual Memo is free to download, with in-app purchases available.

### Do 年号電卓Plus or Annual Memo have ads?

Annual Memo shows ads; 年号電卓Plus does not.

### Which is updated more often, 年号電卓Plus or Annual Memo?

年号電卓Plus ships an update every 6 weeks, and Annual Memo every 5 weeks. Most recently, 年号電卓Plus was updated on July 27, 2026 and Annual Memo on September 8, 2026.

---

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