# Magnetic Monitor — Geomagnetic Data Collection

> Geomagnetic Data Collection (iPhone/iPad app by 书心 刘.)

- Source: https://appshunter.io/ios/app/magnetic-monitor/id6758705432 (this page in markdown: same URL + `.md`)
- Developer: [书心 刘](https://appshunter.io/developer/1803394678)
- Category: Utilities
- Price: Free with in-app purchases (on sale, was $1.99)
- Age rating: 4+
- Requires: iOS 16.0 · 6 MB
- Languages: American English, French (France), German (Germany), Italian, Japanese, Korean, European Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2026-03-08
- Data updated: 2026-08-20
- User reviews in markdown: https://appshunter.io/ios/app/magnetic-monitor/id6758705432/reviews.md

## What is Magnetic Monitor?

Professional Geomagnetic Data Collection Tool

  Magnetic Monitor is a professional app designed for earthquake research and geomagnetic data collection. Utilizing iPhone's built-in
  magnetometer, it enables high-precision real-time collection, analysis, and export of geomagnetic field data.

  Core Features

  Real-time Data Collection
  1Hz sampling rate for precise magnetic field recording. Auto-calculate total field, horizontal component, declination, and inclination.
  Real-time display of X, Y, Z axis magnetic field data in nanoTesla units.

  GPS Positioning
  Accurate recording of sampling point coordinates and altitude. Real-time positioning accuracy display. Background location updates support.

  Data Visualization
  4 synchronized real-time charts showing magnetic field changes. Step interpolation algorithm for clear discrete sampling data. Auto-scaling axes
   for different data ranges.

  Data Management
  Local persistent storage, data never lost. Support for adding notes. Quick search through historical records.

  Data Export (Premium Feature)
  JSON format: Complete data structure with metadata and statistics.
  CSV format: Excel compatible for easy analysis.
  Unlimited export of any number of sampling points.

  Statistical Analysis
  Auto-calculate mean, standard deviation, max, and min values. Magnetic interference detection alerts. Collection duration and sample count
  statistics.

  Use Cases

  Earthquake precursor research
  Geomagnetic field monitoring
  Scientific data collection
  Educational demonstrations
  Magnetic environment assessment

  Technical Features

  MVVM architecture for clean code structure. CoreMotion framework ensuring data accuracy. Swift Charts library for smooth visualization. Support
  for 10 language interfaces.

  Usage Tips

  Recommend 3-5 minutes collection per sampling point. Stay away from metal objects and electronic devices. Keep device level and stable. Best
  results in outdoor open environments.

  Privacy Protection

  All data stored locally on device only. No personal information uploaded. Location data used only for marking sampling points.

  Upgrade to Premium to unlock full data export features and support your research work.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium | $1.99 | one-time |



## Version history (last 4 releases)

### 1.10.3 — 2026-03-23

What's New

  • Improved device compatibility so the app can now be installed on more supported iPhones running iOS 16 and later.

### 1.10.2 — 2026-03-10

Improved ad configuration reliability to ensure ads are served correctly.

### 1.10 — 2026-03-09

- Improved the premium upgrade page to better highlight the ad-free benefit.
  - Refined the action buttons on the detail screen for a cleaner and more consistent layout.
  - Updated localized copy across supported languages for a clearer experience.

### 1.9 — 2026-03-08

No release notes.

## More apps by 书心 刘

- [RunFit Pro](https://appshunter.io/ios/app/runfit-pro/id6751308244)
- [Conway Photo Matrix](https://appshunter.io/ios/app/conway-photo-matrix/id6752801964)
- [PhotoPrune](https://appshunter.io/ios/app/photoprune/id6754231797)
- [Focus25](https://appshunter.io/ios/app/focus25/id6758520641)
- [Pomodoro Timebox](https://appshunter.io/ios/app/pomodoro-timebox/id6762244864)

All apps by 书心 刘: https://appshunter.io/developer/1803394678

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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 2026-08-20.*