# Diffraction Grating Calculator vs Metal&Gold Detector Scanner

The clearest difference is price: Metal&Gold Detector Scanner at Free against Diffraction Grating Calculator's $2.99. Metal&Gold Detector Scanner also leads on update cadence (every 3 months vs every 29 months). Diffraction Grating Calculator's advantage is in-app purchases (none vs 5) and device support (3 vs 1). On ads there is nothing between them.

Metal&Gold Detector Scanner is free to download; Diffraction Grating Calculator costs $2.99 up front. Metal&Gold Detector Scanner sells 5 in-app purchases, starting at $3.99 per 7 days. Diffraction Grating Calculator asks for nothing beyond the download.

Diffraction Grating Calculator ships an update every 29 months, Metal&Gold Detector Scanner every 3 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Diffraction Grating Calculator | Metal&Gold Detector Scanner |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[4.6 (362 ratings)](https://appshunter.io/ios/app/metal-and-gold-detector-scanner/id6478700720/reviews)** |
| Number of ratings | — | **362** |
| Positive reviews | — | 30.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 29 months | **Every 3 months** |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 99 MB |
| Requires iOS | **13** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Gowalk Inc.](https://appshunter.io/developer/1649775469) |

## What reviewers say

### Diffraction Grating Calculator

[App page](https://appshunter.io/ios/app/diffraction-grating-calculator/id1413088894)

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

**In-app purchases:** none


### Metal&Gold Detector Scanner

[App page](https://appshunter.io/ios/app/metal-and-gold-detector-scanner/id6478700720)

Transform your phone into a powerful metal and gold detector. Uncover hidden treasures with advanced sensor technology and an intuitive interface. Ideal for treasure hunters and outdoor explorers of all skill levels.

**Highlights:** Real-time metal and gold detection, Advanced sensor technology, Intuitive user interface, Uninterrupted ad-free experience, Priority support

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $3.99 | per 7 days |
| Premium Subscription | $7.99 | per 7 days |
| Premium Subscription | $9.99 | per 7 days |
| Premium | $29.99 | per year |
| Premium subscription | $49.99 | per year |

**What reviewers like**

- 👍 Integrates with other services
- 👍 One-stop-shop for communication
- 💡 Do Not Disturb mode

**What reviewers complain about**

- 😞 Fake or scam app
- 😞 No exit button on premium offer
- 😞 Time-wasting setup
- 😞 No free trial
- 😞 Charged after cancellation

**Reported bugs**

- App offers premium plan with no exit button
- App takes money after cancellation
- App doesn't work as advertised (gold detection)
- App vibrates constantly
- App requires rating before use

**Requested features**

- Allow users to try before paying
- Provide a clear exit from premium offers


## Frequently asked questions

### Is Diffraction Grating Calculator free?

Diffraction Grating Calculator costs $2.99, with no in-app purchases.

### Is Metal&Gold Detector Scanner free?

Metal&Gold Detector Scanner is free to download, with in-app purchases available.

### Do Diffraction Grating Calculator or Metal&Gold Detector Scanner have ads?

Neither Diffraction Grating Calculator nor Metal&Gold Detector Scanner shows ads.

### Which is updated more often, Diffraction Grating Calculator or Metal&Gold Detector Scanner?

Diffraction Grating Calculator ships an update every 29 months, and Metal&Gold Detector Scanner every 3 months. Most recently, Diffraction Grating Calculator was updated on October 27, 2026 and Metal&Gold Detector Scanner on October 24, 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.*