# Magnetic Sensor

> Turn your phone's magnetometer into a compass, metal detector and field logger

Canonical page: [https://chrome-stats.com/d/com.gonigon.magsensor](https://chrome-stats.com/d/com.gonigon.magsensor)

## Overview

- **ID:** `com.gonigon.magsensor`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Gonigon
- **Category:** TOOLS
- **Downloads:** 333
- **Version:** 1.0.0
- **Last updated:** 2026-08-24
- **First published:** 2026-04-28
- **Publisher country:** KR
- **Size:** 37 MB
- **Data as of:** 2026-09-12
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.gonigon.magsensor)
- **Website:** [https://tjdrhs90.github.io](https://tjdrhs90.github.io/)
- **Privacy policy:** [https://tjdrhs90.github.io/privacy/](https://tjdrhs90.github.io/privacy/)

## Description

Magnetic Sensor turns your phone&#39;s built-in magnetometer into three precise tools:<br><br>• Compass — A live, tilt-compensated compass with cardinal direction (N/E/S/W) and adjustable magnetic declination so the needle points to true north, not just magnetic north.<br><br>• Metal Detector — Set a baseline reading anywhere, choose Low/Med/High sensitivity, and feel haptic pulses that get stronger as the field deviates. Perfect for finding studs in a wall, screws under drywall, or rebar in concrete.<br><br>• Field Logger — Record samples at up to 60 Hz, then export to CSV via the share sheet. Saved recordings stay in the app for replay or re-export.<br><br>KEY FEATURES<br>• Live X / Y / Z axis readings + total field magnitude<br>• Tilt-compensated heading using the accelerometer<br>• Magnitude history sparkline + multi-channel chart<br>• Rolling statistics: mean, standard deviation, RMS, range<br>• Figure-8 calibration helper with quality indicator<br>• Min / Max tracking with one-tap reset<br>• Three sample rates: Slow (500 ms), Normal (100 ms), Fast (16 ms)<br>• Light / Dark / System theme<br>• English and Korean<br>• Unit options: μT, mGauss, nT<br>• Adjustable smoothing<br>• Magnetic declination presets<br>• Haptic alerts for the detector<br>• Keep-screen-awake while recording<br>• CSV export with full timestamp + per-axis data<br><br>PRIVACY<br>All sensor data is processed on-device and never leaves your phone. The app does not collect location, contacts, or personal information. Anonymous mobile advertising is used to keep the app free; you can watch a rewarded ad to unlock unlimited CSV sharing for the session.<br><br>WHO IT&#39;S FOR<br>• Hobbyists exploring magnetic fields<br>• DIYers detecting screws, studs, and rebar<br>• Students collecting data for physics or geology projects<br>• Hikers wanting a reliable phone compass<br>• Anyone curious about the invisible field around them<br><br>REQUIREMENTS<br>A device with a magnetometer (most phones built since ~2013). The app cannot work on devices without one — it will tell you on launch.

## Rankings

- #1,524,123 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_ADSERVICES_TOPICS`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.FOREGROUND_SERVICE`
- `android.permission.INTERNET`
- `android.permission.READ_EXTERNAL_STORAGE`
- `android.permission.SYSTEM_ALERT_WINDOW`
- `android.permission.VIBRATE`
- `android.permission.WAKE_LOCK`
- `android.permission.WRITE_EXTERNAL_STORAGE`
- `com.android.vending.CHECK_LICENSE`
- `com.gonigon.magsensor.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`
- `com.google.android.gms.permission.AD_ID`

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.gonigon.magsensor)