# 年号電卓Plus vs Protractor Measuring Angle

The clearest difference is update cadence: Protractor Measuring Angle at every 2 days against 年号電卓Plus's every 6 weeks. On price, ads, in-app purchases and monetization model 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, Protractor Measuring Angle every 2 days. The most recent releases landed on October 12, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | 年号電卓Plus | Protractor Measuring Angle |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (2 ratings)](https://appshunter.io/ios/app/protractor-measuring-angle/id6785106013/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 days** |
| Monetization | Free | Free |
| Size | 7 MB | 16 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nakanishi Toshihiko](https://appshunter.io/developer/712843914) | [MSR TECH LLP](https://appshunter.io/developer/1761560109) |

## 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


### Protractor Measuring Angle

[App page](https://appshunter.io/ios/app/protractor-measuring-angle/id6785106013)

This app transforms your iPhone into a versatile digital measuring tool. It offers multiple functions to measure angles, slopes, distances, and even height using your device's sensors and camera. Save and review your measurement history for future reference.

**Highlights:** Inclinometer for real-time tilt measurement, Screen protractor for precise angle reading, Camera level with horizon overlay, Photo angle measurement on existing images, Height calculator using trigonometry, AR Measure for 3D space measurements, On-screen ruler and digital compass

**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 Protractor Measuring Angle free?

Protractor Measuring Angle is free to download, with no in-app purchases.

### Do 年号電卓Plus or Protractor Measuring Angle have ads?

Neither 年号電卓Plus nor Protractor Measuring Angle shows ads.

### Which is updated more often, 年号電卓Plus or Protractor Measuring Angle?

年号電卓Plus ships an update every 6 weeks, and Protractor Measuring Angle every 2 days. Most recently, 年号電卓Plus was updated on October 12, 2026 and Protractor Measuring Angle on October 2, 2026.

---

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