# Wallpaper Optimizer(WO) vs 안찰칵

The clearest difference is price: 안찰칵 at Free against Wallpaper Optimizer(WO)'s $2.99. 안찰칵 also leads on review sentiment (100% vs 58%) and update cadence (every 4 days vs fortnightly). Wallpaper Optimizer(WO)'s advantage is ads (none vs shown) and iOS requirement (12.3 vs 17.2). On in-app purchases and device support there is nothing between them.

안찰칵 is free to download; Wallpaper Optimizer(WO) costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Wallpaper Optimizer(WO) ships an update fortnightly, 안찰칵 every 4 days. Both last shipped on November 11, 2026.

## The numbers

| Metric | Wallpaper Optimizer(WO) | 안찰칵 |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Positive reviews | 57.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | Paid | **Ad-supported** |
| Size | 11 MB | 10 MB |
| Requires iOS | **12.3** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [KhunG System](https://appshunter.io/developer/516481496) | [Bo Hyeon Seo](https://appshunter.io/developer/6794987793) |

## What reviewers say

### Wallpaper Optimizer(WO)

[App page](https://appshunter.io/ios/app/wallpaper-optimizerwo/id775517253)

Easily resize and customize photos to perfectly fit your device's wallpaper and widgets. Fix common issues like the parallax effect and create unique backgrounds with various filters and color options.

**Highlights:** Resize photos to fit screen, Fix parallax effect, Add color backgrounds, Transparent widget support, Blur effects, Extract image from video

**Features:** macOS Compatibility

**In-app purchases:** none


### 안찰칵

[App page](https://appshunter.io/ios/app/id6794987791)

Capture photos and videos silently without disturbing others. Ideal for lectures, libraries, or quiet moments with loved ones. Enjoy a seamless, distraction-free photography experience.

**Highlights:** Always silent shooting, Silent video recording, Silent selfie mode, iPad support, Visual and haptic feedback, Selectable photo aspect ratios, Smooth zoom

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

**In-app purchases:** none


## Frequently asked questions

### Is Wallpaper Optimizer(WO) free?

Wallpaper Optimizer(WO) costs $2.99, with no in-app purchases.

### Is 안찰칵 free?

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

### Do Wallpaper Optimizer(WO) or 안찰칵 have ads?

안찰칵 shows ads; Wallpaper Optimizer(WO) does not.

### Which is updated more often, Wallpaper Optimizer(WO) or 안찰칵?

Wallpaper Optimizer(WO) ships an update fortnightly, and 안찰칵 every 4 days. Most recently, Wallpaper Optimizer(WO) was updated on November 11, 2026 and 안찰칵 on November 11, 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.*