# Metal Detector・EMF Reader vs CardIndex

The clearest difference is monetization model: Metal Detector・EMF Reader at free against CardIndex's freemium. Metal Detector・EMF Reader also leads on iOS requirement (16.6 vs 26.5). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Metal Detector・EMF Reader sells 1 one-off in-app purchase and CardIndex sells 4 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Metal Detector・EMF Reader ships an update weekly, CardIndex every 5 days. Both last shipped on November 5, 2026.

## The numbers

| Metric | Metal Detector・EMF Reader | CardIndex |
| --- | --- | --- |
| 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 | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 5 days** |
| Monetization | **Free** | Freemium |
| Size | 18 MB | 22 MB |
| Requires iOS | **16.6** | 26.5 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Yash Mandhyan](https://appshunter.io/developer/1856960217) | [Jackson Berry](https://appshunter.io/developer/6779029810) |

## 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 |


### CardIndex

[App page](https://appshunter.io/ios/app/cardindex-tcg-analysis/id6779029808)

Track trading card prices and market data to make informed collecting decisions. Get real-time values, analysis scores, and historical trends to buy, hold, or sell with confidence.

**Highlights:** Real market value based on recent sales, CardIndex Score and signal (BUY, HOLD, etc.), 12-month price history and projections, PSA 10 premium and grade-by-grade pricing, Watchlist with price and signal alerts, Track collection value, cost basis, and gain/loss

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CardIndex Standard – Monthly | $5.99 | per month |
| CardIndex Pro – Monthly | $11.99 | per month |
| CardIndex Standard – Annual | $49.99 | per year |
| CardIndex Pro – Annual Subscription | $99.99 | per year |


## Frequently asked questions

### Is Metal Detector・EMF Reader free?

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

### Is CardIndex free?

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

### Do Metal Detector・EMF Reader or CardIndex have ads?

Neither Metal Detector・EMF Reader nor CardIndex shows ads.

### Which is updated more often, Metal Detector・EMF Reader or CardIndex?

Metal Detector・EMF Reader ships an update weekly, and CardIndex every 5 days. Most recently, Metal Detector・EMF Reader was updated on November 5, 2026 and CardIndex on November 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*