# 年号電卓Plus vs Calculator

The clearest difference is in-app purchases: 年号電卓Plus at none against Calculator's 1. 年号電卓Plus also leads on ads (none vs shown). Calculator's advantage is iOS requirement (15.6 vs 17.6). On price, review sentiment, update cadence and device support there is nothing between them.

Both are free to download. Calculator 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, Calculator every 2 months. Both last shipped on October 12, 2026.

## The numbers

| Metric | 年号電卓Plus | Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (10 ratings)](https://appshunter.io/ios/app/calculator-calcpro/id1321874059/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | 37.5% of reviews | **42.9% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 4 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nakanishi Toshihiko](https://appshunter.io/developer/712843914) | [Hideki Ogawa](https://appshunter.io/developer/498921566) |

## 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


### Calculator

[App page](https://appshunter.io/ios/app/calculator-calcpro/id1321874059)

This utility app allows users to perform calculations and view the formulas used. It offers the ability to edit past calculations and share results via email or memos. An optional purchase can remove advertisements.

**Highlights:** View calculation formulas, Edit past formulas, Share calculations, Ad-free option via purchase, Output to memos or email

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove in-app ads | $2.99 | 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 Calculator free?

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

### Do 年号電卓Plus or Calculator have ads?

Calculator shows ads; 年号電卓Plus does not.

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

年号電卓Plus ships an update every 6 weeks, and Calculator every 2 months. Most recently, 年号電卓Plus was updated on October 12, 2026 and Calculator on October 12, 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.*