# Magnetic Field Metal Detector vs Spark Plug Reader

The clearest difference is update cadence: Spark Plug Reader at every 2 days against Magnetic Field Metal Detector's every 10 days. Magnetic Field Metal Detector's advantage is iOS requirement (14.0 vs 16.4). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Magnetic Field Metal Detector sells 3 in-app purchases, starting at $1.99 per 7 days and Spark Plug Reader sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Magnetic Field Metal Detector ships an update every 10 days, Spark Plug Reader every 2 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Magnetic Field Metal Detector | Spark Plug Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (14 ratings)](https://appshunter.io/ios/app/magnetic-field-metal-detector/id6755330975/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 37 MB |
| Requires iOS | **14.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [三三 杨](https://appshunter.io/developer/1852457327) | [EVREN YUCEBAS](https://appshunter.io/developer/6782353474) |

## What reviewers say

### Magnetic Field Metal Detector

[App page](https://appshunter.io/ios/app/magnetic-field-metal-detector/id6755330975)

This utility app uses your device's magnetometer to measure magnetic fields, detect EMF, and visualize magnetic data in real-time. It can help identify magnetic metal objects by sensing disturbances in the surrounding magnetic field and offers customizable alerts.

**Highlights:** Magnetic field strength measurement, EMF detection, Real-time XYZ magnetic sensor data, Magnetic field direction indication, Customizable threshold alerts, Multi-language support, Dark mode

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $1.99 | per 7 days |
| Monthly Subscription | $4.99 | per month |
| Lifetime Membership | $6.99 | one-time |


### Spark Plug Reader

[App page](https://appshunter.io/ios/app/spark-plug-reader/id6805215335)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $4.99 | one-time |


## Frequently asked questions

### Is Magnetic Field Metal Detector free?

Magnetic Field Metal Detector is free to download, with in-app purchases available.

### Is Spark Plug Reader free?

Spark Plug Reader is free to download, with in-app purchases available.

### Do Magnetic Field Metal Detector or Spark Plug Reader have ads?

Neither Magnetic Field Metal Detector nor Spark Plug Reader shows ads.

### Which is updated more often, Magnetic Field Metal Detector or Spark Plug Reader?

Magnetic Field Metal Detector ships an update every 10 days, and Spark Plug Reader every 2 days. Most recently, Magnetic Field Metal Detector was updated on October 30, 2026 and Spark Plug Reader on October 31, 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.*