# Wallpapers 4K & HD Background vs Charging Engine

The clearest difference is rating: Charging Engine at 4.8 against Wallpapers 4K & HD Background's 4.5. Charging Engine also leads on ratings volume (11K vs 1.6K) and iOS requirement (12.0 vs 14.0). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Wallpapers 4K & HD Background sells 7 in-app purchases, starting at $7.99 per 7 days and Charging Engine sells 12 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 4.5. That said, the two scores are not equally well evidenced: Charging Engine has 11K ratings behind it against 1.6K, so its average is the more settled of the two. Written reviews point the same way: 44% of Wallpapers 4K & HD Background's written reviews are positive against 52% of Charging Engine's.

Wallpapers 4K & HD Background ships an update every 5 weeks, Charging Engine every 6 weeks. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Wallpapers 4K & HD Background | Charging Engine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (1.6K ratings)](https://appshunter.io/ios/app/wallpapers-4k-and-hd-background/id1467866773/reviews) | **[4.8 (11K ratings)](https://appshunter.io/ios/app/charging-engine-4kwallpapers/id1602309907/reviews)** |
| Number of ratings | 1.6K | **11K** |
| Positive reviews | 43.7% of reviews | **51.6% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 6 weeks |
| Monetization | Subscription | Subscription |
| Size | 206 MB | 112 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Appenvision Ltd](https://appshunter.io/developer/1517746904) | [Bluewolf Technology Limited](https://appshunter.io/developer/1477300424) |

## What reviewers say

### Wallpapers 4K & HD Background

[App page](https://appshunter.io/ios/app/wallpapers-4k-and-hd-background/id1467866773)

Customize your device with a vast library of high-resolution wallpapers. Explore categorized collections, preview before saving, and personalize your home screen with unique icon frames. Find images to match any mood and enjoy regular updates.

**Highlights:** Categorized wallpaper collections, Vast image library, User-friendly interface, High-resolution images, Icon frame customization, Bookmark favorite wallpapers, Regular content updates

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly subscription | $7.99 | per 7 days |
| Unique Backgrounds | $9.99 | per 7 days |
| Unique Backgrounds | $9.99 | per 7 days |
| Stylish Wallpaper Designs | $19.99 | per month |
| Expanded Wallpaper Packs | $49.99 | per year |
| Expanded Wallpaper Packs | $49.99 | per year |
| Cute Wallpapers | $99.99 | per year |

**What reviewers like**

- 👍 Great app
- 🎨 Awesome wallpapers
- 💥 Cool graphics
- 🌟 Lots of options
- 🌈 Colorful designs

**What reviewers complain about**

- 🤑 Paywalled content
- 📢 Excessive ads
- 🔍 Lack of search function
- 🤔 Confusing UI
- 🕰️ Slow performance

**Reported bugs**

- Wallpapers not applying correctly
- App crashing or freezing
- Connectivity issues

**Requested features**

- Add search bar to find specific wallpapers
- Improve free content selection
- Reduce ads and paywall restrictions
- Optimize app performance


### 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 (12)**

| 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 | $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 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 Wallpapers 4K & HD Background free?

Wallpapers 4K & HD Background 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, Wallpapers 4K & HD Background or Charging Engine?

Charging Engine is rated higher. Wallpapers 4K & HD Background averages 4.5 out of 5 from 1.6K ratings, while Charging Engine averages 4.8 from 11K ratings.

### Do Wallpapers 4K & HD Background or Charging Engine have ads?

Neither Wallpapers 4K & HD Background nor Charging Engine shows ads.

### Which is updated more often, Wallpapers 4K & HD Background or Charging Engine?

Wallpapers 4K & HD Background ships an update every 5 weeks, and Charging Engine every 6 weeks. Most recently, Wallpapers 4K & HD Background was updated on October 29, 2026 and Charging Engine on October 31, 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.*