# Metal Detector・EMF Reader vs Span64 Construction Calculator

The clearest difference is iOS requirement: Metal Detector・EMF Reader at 16.6 against Span64 Construction Calculator's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Metal Detector・EMF Reader sells 1 one-off in-app purchase and Span64 Construction Calculator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 19, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Metal Detector・EMF Reader | Span64 Construction Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/metal-detectoremf-reader/id6749162622/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | Free | — |
| Size | 18 MB | 29 MB |
| Requires iOS | **16.6** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Yash Mandhyan](https://appshunter.io/developer/1856960217) | [Roberto Garrido](https://appshunter.io/developer/943471024) |

## What reviewers say

### Metal Detector・EMF Reader

[App page](https://appshunter.io/ios/app/metal-detectoremf-reader/id6749162622)

Transform your iPhone into a versatile tool for detecting metal objects, locating wall studs, and measuring EMF levels. Utilize the device's built-in magnetometer for real-time insights into magnetic fields and signal strength, perfect for various DIY and utility tasks.

**Highlights:** Detect nearby metal objects, Find wall studs, screws, nails, pipes, Real-time magnetic field readings, Live EMF meter and graph visualization, Signal confidence indicator, Axis-based directional detection

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Access | $2.99 | one-time |


### Span64 Construction Calculator

[App page](https://appshunter.io/ios/app/span64-construction-calculator/id6789300863)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Span64 Pro | $19.99 | one-time |


## Frequently asked questions

### Is Metal Detector・EMF Reader free?

Metal Detector・EMF Reader is free to download, with in-app purchases available.

### Is Span64 Construction Calculator free?

Span64 Construction Calculator is free to download, with in-app purchases available.

### Do Metal Detector・EMF Reader or Span64 Construction Calculator have ads?

Neither Metal Detector・EMF Reader nor Span64 Construction Calculator shows ads.

### Which is updated more often, Metal Detector・EMF Reader or Span64 Construction Calculator?

Metal Detector・EMF Reader ships an update weekly, and Span64 Construction Calculator weekly. Most recently, Metal Detector・EMF Reader was updated on October 19, 2026 and Span64 Construction Calculator on October 21, 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.*