# PDF Scanner app vs QR Engine

The clearest difference is in-app purchases: QR Engine at none against PDF Scanner app's 4. PDF Scanner app's advantage is update cadence (every 4 days vs every 2 months) and iOS requirement (15.0 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. PDF Scanner app sells 4 in-app purchases, starting at $4.99 per 7 days. QR Engine asks for nothing beyond the download.

PDF Scanner app ships an update every 4 days, QR Engine every 2 months. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | PDF Scanner app | QR Engine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.3K ratings)](https://appshunter.io/ios/app/pdf-scanner-app-doc-scanner/id1526957611/reviews)** | — |
| Number of ratings | **1.3K** | — |
| Positive reviews | 28.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 42 MB | 1 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mikhail Katin](https://appshunter.io/developer/1526957613) | [Ibrahim Uzun](https://appshunter.io/developer/1819090208) |

## What reviewers say

### PDF Scanner app

[App page](https://appshunter.io/ios/app/pdf-scanner-app-doc-scanner/id1526957611)

Transform your phone into a powerful document scanner. Easily capture, edit, sign, and share documents in PDF format. Securely store all your important papers, from contracts and IDs to receipts and notes, directly on your device.

**Highlights:** Scan documents to PDF, Edit scanned documents, Sign documents digitally, Store documents securely, Share documents easily, Text recognition

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| The PDF Scanner documеntѕ арр | $4.99 | per 7 days |
| The PDF Scanner documеntѕ арр | $14.99 | per month |
| Yearly | $39.99 | per year |
| Full version | $29.99 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🚀 Excellent for scanning documents
- 💡 Helpful for immigration documents

**What reviewers complain about**

- 🐛 Frequent crashes and issues with saving/sending scans
- 💰 Requires paid subscription to access full functionality
- 🔒 Limited free features, need to pay to unlock

**Reported bugs**

- Scanned documents not saving or sending properly
- App randomly switching to 'auto' mode
- Inconsistent document naming when sharing

**Requested features**

- Add ability to edit scanned documents
- Improve image quality of scans
- Provide more free features without subscription


### QR Engine

[App page](https://appshunter.io/ios/app/qr-engine/id6748863405)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PDF Scanner app free?

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

### Is QR Engine free?

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

### Do PDF Scanner app or QR Engine have ads?

Neither PDF Scanner app nor QR Engine shows ads.

### Which is updated more often, PDF Scanner app or QR Engine?

PDF Scanner app ships an update every 4 days, and QR Engine every 2 months. Most recently, PDF Scanner app was updated on October 17, 2026 and QR Engine on October 8, 2026.

---

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