# Magnetometer vs WatchWatcher

The clearest difference is update cadence: WatchWatcher at every 9 months against Magnetometer's every 34 months. Magnetometer's advantage is price ($0.99 vs $1.99) and iOS requirement (16.0 vs 18.2). On ads, in-app purchases and device support there is nothing between them.

Magnetometer costs $0.99 and WatchWatcher $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Magnetometer ships an update every 34 months, WatchWatcher every 9 months. Both last shipped on October 9, 2026.

## The numbers

| Metric | Magnetometer | WatchWatcher |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| Rating | **[4.4 (13 ratings)](https://appshunter.io/ios/app/magnetometer/id1662997574/reviews)** | — |
| Number of ratings | **13** | — |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 34 months | **Every 9 months** |
| Monetization | Paid | — |
| Size | 2 MB | 14 MB |
| Requires iOS | **16.0** | 18.2 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Bogdan Gavriluta](https://appshunter.io/developer/1584690995) | [silas slack](https://appshunter.io/developer/410593289) |

## What reviewers say

### Magnetometer

[App page](https://appshunter.io/ios/app/magnetometer/id1662997574)

This application uses your iPhone's compass to detect electromagnetic interference, helping you find metal objects or magnets. It's designed for fun and experimental purposes, not as a professional tool. Discover hidden metal items or simply explore the magnetic fields around you.

**Highlights:** Detects metal and magnets, Uses iPhone's compass, Measures EMF interference, Fun and experimental use, Simple user interface

**In-app purchases:** none


### WatchWatcher

[App page](https://appshunter.io/ios/app/watchwatcher-accuracy-tracker/id6742189328)

**In-app purchases:** none


## Frequently asked questions

### Is Magnetometer free?

Magnetometer costs $0.99, with no in-app purchases.

### Is WatchWatcher free?

WatchWatcher costs $1.99, with no in-app purchases.

### Do Magnetometer or WatchWatcher have ads?

Neither Magnetometer nor WatchWatcher shows ads.

### Which is updated more often, Magnetometer or WatchWatcher?

Magnetometer ships an update every 34 months, and WatchWatcher every 9 months. Most recently, Magnetometer was updated on October 9, 2026 and WatchWatcher on October 9, 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.*