# QR Previewer vs Stud Finder App

The clearest difference is in-app purchases: QR Previewer at none against Stud Finder App's 2. QR Previewer also leads on ads (none vs shown). Stud Finder App's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price there is nothing between them.

Both are free to download. Stud Finder App sells 2 in-app purchases, starting at $9.99 per year. QR Previewer asks for nothing beyond the download.

## The numbers

| Metric | QR Previewer | Stud Finder App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (4 ratings)](https://appshunter.io/ios/app/stud-finder-app-wall-scanner/id6794059128/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Monetization | — | Free with in-app purchases |
| Size | 5 MB | 53 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lee Hyojoong](https://appshunter.io/developer/1888028738) | [Ebenezer Oteng](https://appshunter.io/developer/1840002550) |

## What reviewers say

### QR Previewer

[App page](https://appshunter.io/ios/app/qr-previewer/id6762736386)

**In-app purchases:** none


### Stud Finder App

[App page](https://appshunter.io/ios/app/stud-finder-app-wall-scanner/id6794059128)

This utility app uses your phone's magnetometer to detect metal objects like nails, screws, pipes, and rebar hidden within walls. It offers two scanning modes and provides real-time feedback to help you avoid drilling into unwanted materials.

**Highlights:** Magnetometer-based metal detection, Two distinct scan modes (Stud & Metal), One-tap calibration, Live signal gauge with haptic feedback, Save and revisit scans, Light and dark themes, Deep Scan Pro feature

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yearly | $9.99 | per year |
| Lifetime | $7.99 | one-time |


## Frequently asked questions

### Is QR Previewer free?

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

### Is Stud Finder App free?

Stud Finder App is free to download, with in-app purchases available.

### Do QR Previewer or Stud Finder App have ads?

Stud Finder App shows ads; QR Previewer does not.

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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.*