# EMF Scan — 電磁場計測ツール

> 電磁場計測ツール (iPhone/iPad app by Yasuhiro Kodama.)

- Source: https://appshunter.io/ios/app/emf-scan/id6770155541 (this page in markdown: same URL + `.md`)
- Developer: [Yasuhiro Kodama](https://appshunter.io/developer/1895805086)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 29 MB
- Languages: American English
- Released: 2026-05-19
- Data updated: 2026-07-21
- User reviews in markdown: https://appshunter.io/ios/app/emf-scan/id6770155541/reviews.md

## What is EMF Scan?

Measure electromagnetic fields (EMF) in real time using your smartphone's built-in magnetic sensor.

[Key Features]
• Real-time magnetic field strength display (switch between µT / mG)
• Automatic saving of measurement data and history management
• Map view of measurement locations
• Sound alarm (volume changes with field strength)
• Color themes (11 in total — dark and light pastel)
• Ad-removal option (one-time purchase; also unlocks some color themes)

[Great For]
• Anyone concerned about magnetic fields around home appliances or power lines
• Anyone who wants an easy alternative to a dedicated EMF meter
• Anyone who wants to record and manage measurement data

* This app uses your smartphone's magnetic sensor. Its accuracy differs from that of a dedicated measuring instrument.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 広告を削除 | $0.99 | one-time |



## Version history (last 5 releases)

### 1.0.5 — 2026-07-19

What's New
• Added color themes. Tap the palette icon on the Scan screen to choose from 11 themes — 7 dark and 4 light pastel.
• Some themes, including the pastels, unlock with the "Remove Ads" purchase.

### 1.0.4 — 2026-06-04

計測精度と安定性を改善しました。

  • 磁場の計測精度を向上。キャリブレーション（補正）がより正確・安定になりました
  • 端末を静止させたときの交流磁場の検出感度を改善。動かしている間の誤検出も抑えました
  • 3軸グラフの時間軸を端末ごとの差によらず正確に表示するよう改善
  • ピーク値の記録精度を改善
  • 表示の細かな調整と内部の最適化

  Improved measurement accuracy and stability.

  • Improved magnetic field measurement accuracy, with more reliable and consistent calibration
  • Better sensitivity to AC magnetic fields when the device is held still, while reducing false readings during
  movement
  • More accurate time axis on the 3-axis graph across different devices
  • Improved accuracy of peak value recording
  • Minor display refinements and internal optimizations

### 1.0.3 — 2026-05-29

• スキャン画面にネイティブ広告を追加                                                                                  
  • 起動時の磁気センサー補正精度を改善                                                                                  
  • 起動直後に100μTを超える値が表示されることがある問題を修正                                                           
  • 補正中であることを画面上に表示するようにしました                                                                    
                                                                                                                                                                                                                                      
  • Added native ads on the scan screen                                                                                 
  • Improved magnetometer calibration accuracy on startup                                                               
  • Fixed an issue where values could exceed 100μT immediately after launch                                             
  • Added on-screen indicator to show when calibration is in progress

### 1.0.2 — 2026-05-21

日本語：                                                                                                              
  アプリアイコンの表示が正しくなかった問題を修正しました。
                                                                                                                        
  English:                                                  
  Fixed an issue where the app icon was not displaying correctly.

### 1.0.1 — 2026-05-20

日本語                                                                                                                
  広告表示の不具合を修正しました。                                                                                      
  計測履歴の保存件数を最大200件に制限しました。                                                                         
                                                                                                                        
  English（英語版も入力できる場合）           
  Fixed an issue where banner ads were not displayed.                                                                   
  Measurement history is now limited to a maximum of 200 records.

## More apps by Yasuhiro Kodama

- [Silent Scan](https://appshunter.io/ios/app/silent-scan/id6764492794)

All apps by Yasuhiro Kodama: https://appshunter.io/developer/1895805086

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-21.*