# 年号電卓Plus vs See through Calculator

The clearest difference is ads: 年号電卓Plus at none against See through Calculator's shown. See through Calculator's advantage is update cadence (fortnightly vs every 6 weeks) and iOS requirement (15.8.3 vs 17.6). On price, 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, See through Calculator fortnightly. The most recent releases landed on October 12, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | 年号電卓Plus | See through Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Fortnightly** |
| Monetization | Free | — |
| Size | 7 MB | 35 MB |
| Requires iOS | 17.6 | **15.8.3** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nakanishi Toshihiko](https://appshunter.io/developer/712843914) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## 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


### See through Calculator

[App page](https://appshunter.io/ios/app/see-through-calculator/id6737427308)

**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 See through Calculator free?

See through Calculator is free to download, with no in-app purchases.

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

See through Calculator shows ads; 年号電卓Plus does not.

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

年号電卓Plus ships an update every 6 weeks, and See through Calculator fortnightly. Most recently, 年号電卓Plus was updated on October 12, 2026 and See through Calculator on October 4, 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.*