# PaperVault vs Metal Detector・EMF Reader

The clearest difference is review sentiment: Metal Detector・EMF Reader at 100% against PaperVault's 50%. Metal Detector・EMF Reader also leads on update cadence (weekly vs every 3 months) and iOS requirement (16.6 vs 18.0). PaperVault's advantage is in-app purchases (none vs 1). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Metal Detector・EMF Reader sells 1 one-off in-app purchase. PaperVault asks for nothing beyond the download.

PaperVault ships an update every 3 months, Metal Detector・EMF Reader weekly. The most recent releases landed on June 1, 2026 and August 9, 2026 respectively.

## The numbers

| Metric | PaperVault | Metal Detector・EMF Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/metal-detectoremf-reader/id6749162622/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free | Free |
| Size | 20 MB | 18 MB |
| Requires iOS | 18.0 | **16.6** |
| Devices | **iPhone, Mac** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Miguel Barreto da Silva Arroz](https://appshunter.io/developer/1804391741) | [Yash Mandhyan](https://appshunter.io/developer/1856960217) |

## What reviewers say

### PaperVault

[App page](https://appshunter.io/ios/app/papervault/id6743766364)

This app securely stores your digital information by converting it into printable QR codes. It uses strong encryption and keeps all data local, offering a reliable offline backup solution that combines the longevity of paper with digital security.

**Highlights:** QR code data storage, Password protection, Robust encryption, Local data storage, Printable data format, Offline data backup

**In-app purchases:** none


### 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 | $1.99 | one-time |


## Frequently asked questions

### Is PaperVault free?

PaperVault is free to download, with no in-app purchases.

### Is Metal Detector・EMF Reader free?

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

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

Neither PaperVault nor Metal Detector・EMF Reader shows ads.

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

PaperVault ships an update every 3 months, and Metal Detector・EMF Reader weekly. Most recently, PaperVault was updated on June 1, 2026 and Metal Detector・EMF Reader on August 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.*