# Magnetometer vs Fettle

The clearest difference is price: Fettle at Free against Magnetometer's $0.99. Fettle also leads on update cadence (every 2 weeks vs every 34 months). Magnetometer's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Fettle is free to download; Magnetometer costs $0.99 up front. Fettle sells 1 in-app purchase, starting at $34.99 per year. Magnetometer asks for nothing beyond the download.

Magnetometer ships an update every 34 months, Fettle every 2 weeks. The most recent releases landed on October 9, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Magnetometer | Fettle |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 34 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 2 MB | 239 MB |
| Requires iOS | **16.0** | 16.4 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Bogdan Gavriluta](https://appshunter.io/developer/1584690995) | [Stewart Burton](https://appshunter.io/developer/1883761849) |

## 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


### Fettle

[App page](https://appshunter.io/ios/app/fettle-tool-inventory/id6788440954)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fettle Pro | $34.99 | per year |


## Frequently asked questions

### Is Magnetometer free?

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

### Is Fettle free?

Fettle is free to download, with in-app purchases available.

### Do Magnetometer or Fettle have ads?

Neither Magnetometer nor Fettle shows ads.

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

Magnetometer ships an update every 34 months, and Fettle every 2 weeks. Most recently, Magnetometer was updated on October 9, 2026 and Fettle on October 10, 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.*