# Metal Detector vs Spark Plug Reader

The clearest difference is ads: Spark Plug Reader at none against Metal Detector's shown. Spark Plug Reader also leads on update cadence (every 2 days vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Metal Detector sells 3 in-app purchases, starting at $0.99 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.

Metal Detector ships an update every 3 weeks, Spark Plug Reader every 2 days. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Metal Detector | Spark Plug Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (16 ratings)](https://appshunter.io/ios/app/metal-detector-magnet-finder/id6744274897/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 32 MB | 37 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [ITincubator UAB](https://appshunter.io/developer/1617775851) | [EVREN YUCEBAS](https://appshunter.io/developer/6782353474) |

## What reviewers say

### Metal Detector

[App page](https://appshunter.io/ios/app/metal-detector-magnet-finder/id6744274897)

This tool uses your phone's magnetic sensor to detect metal objects and measure magnetic field strength. It provides real-time readings, visual and audio alerts for increased fields, and a history graph to track changes.

**Highlights:** Real-time magnetic field measurement, Accurate metal detection, Dial interface with instant response, Adjustable sensitivity levels, Sound and vibration alerts, History graph

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Metal Detector App | $0.99 | per 7 days |
| Metal Detector App | $0.99 | per 7 days |
| Metal Detector App | $5.99 | per year |


### 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 Metal Detector free?

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 Metal Detector or Spark Plug Reader have ads?

Metal Detector shows ads; Spark Plug Reader does not.

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

Metal Detector ships an update every 3 weeks, and Spark Plug Reader every 2 days. Most recently, Metal Detector was updated on October 24, 2026 and Spark Plug Reader on October 6, 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.*