# QR Scanner vs Charging Engine

The clearest difference is review sentiment: Charging Engine at 52% against QR Scanner's 0%. Charging Engine also leads on rating (4.8 vs 3.1) and ads (none vs shown). QR Scanner's advantage is monetization model (free with in-app purchases vs subscription) and update cadence (weekly vs every 6 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. QR Scanner sells 4 in-app purchases, starting at $1.99 per 7 days and Charging Engine sells 10 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Charging Engine holds the better App Store score, 4.8 against 3.1. That said, the two scores are not equally well evidenced: Charging Engine has 11K ratings behind it against 34, so its average is the more settled of the two. Written reviews point the same way: 0% of QR Scanner's written reviews are positive against 52% of Charging Engine's.

QR Scanner ships an update weekly, Charging Engine every 6 weeks. The most recent releases landed on November 3, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | QR Scanner | Charging Engine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (34 ratings)](https://appshunter.io/ios/app/qr-scanner-best-smallest/id1563363456/reviews) | **[4.8 (11K ratings)](https://appshunter.io/ios/app/charging-engine-4kwallpapers/id1602309907/reviews)** |
| Number of ratings | 34 | **11K** |
| Positive reviews | 0.0% of reviews | **51.6% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 6 weeks |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 50 MB | 112 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HUIENTZ UK LTD](https://appshunter.io/developer/1724722196) | [Bluewolf Technology Limited](https://appshunter.io/developer/1477300424) |

## What reviewers say

### QR Scanner

[App page](https://appshunter.io/ios/app/qr-scanner-best-smallest/id1563363456)

Easily scan and read QR codes and barcodes with this safe and professional tool. It automatically detects and decodes information without needing an internet connection. Protects user privacy by only requesting necessary camera permissions.

**Highlights:** Scan all QR codes and barcodes, Instant scanning and decoding, No internet connection required, Scan history, Minimal permissions required, User privacy protected

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Week Premium - Basic | $1.99 | per 7 days |
| One Month Premium - Standard | $6.99 | per month |
| One Year Premium - Popular | $14.99 | per year |
| Lifetime Premium - Best Value | $19.99 | one-time |


### Charging Engine

[App page](https://appshunter.io/ios/app/charging-engine-4kwallpapers/id1602309907)

Enhance your phone's charging experience with dynamic, futuristic animations and live wallpapers. Visualize battery performance and enjoy regular content updates to keep your device looking fresh and engaging.

**Highlights:** Futuristic charging animations, High-definition dynamic screensavers, Dozens of 3D charging wallpapers, Live wallpaper collections, Battery performance monitor, Regular content updates

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ChargingEngine Subscription | $3.99 | per 7 days |
| ChargingEngine Subscription | $3.99 | per 7 days |
| Weekly subscription | $4.99 | per 7 days |
| ChargingEngine Subscription | $19.99 | per month |
| ChargingEngine Subscription | $19.99 | per month |
| ChargingEngine Subscription | $23.99 | per month |
| ChargingEngine Subscription | $23.99 | per month |
| ChargingEngine Subscription | $69.99 | per year |
| ChargingEngine Subscription | $69.99 | per year |
| ChargingEngine lifetime | $69.99 | one-time |

**What reviewers like**

- 🚀 Charging animations are cool
- 👍 Variety of wallpaper options
- 💡 Customizable charging experience

**What reviewers complain about**

- 🔒 Requires subscription to access full features
- 🐛 Buggy and crashes frequently
- 🔋 Drains battery when app is open
- 💸 Misleading about free trial, charges immediately

**Reported bugs**

- Wallpapers don't work as advertised
- App only functions when kept open during charging
- Subscription cannot be easily canceled

**Requested features**

- Add search bar to find desired wallpapers
- Allow users to upload their own photos/videos
- Provide option to mute sound effects
- Make app fully free without subscription


## Frequently asked questions

### Is QR Scanner free?

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

### Is Charging Engine free?

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

### Which has better reviews, QR Scanner or Charging Engine?

Charging Engine is rated higher. QR Scanner averages 3.1 out of 5 from 34 ratings, while Charging Engine averages 4.8 from 11K ratings.

### Do QR Scanner or Charging Engine have ads?

QR Scanner shows ads; Charging Engine does not.

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

QR Scanner ships an update weekly, and Charging Engine every 6 weeks. Most recently, QR Scanner was updated on November 3, 2026 and Charging Engine on November 10, 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.*