Comparison

Wallpaper Optimizer(WO) vs 안찰칵

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Wallpaper Optimizer(WO)

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
Read full description

What people say about Optimizer: This works perfectly. Adds a color background to make the image larger and reduce zoom. Also gives option of parallax or not. -Stephanie DeWitt works perfectly fine and is exactly what I needed for my photos! I recommend this app if you can't seem to get a full picture set as your wallpaper saves the struggle of screenshotting and trying to figure it a way The picture will fit your locks screen or home screen. Love it!!!!!! - Tmkristi Just happened upon this app while looking for fixes to the parallax problem and used it ONCE and it works PERFECTLY!! Definitely going to recommended this app to everyone! - Twitch*CFL Easy to fix the parallax effect when setting wallpapers. Great app! -Hannah B This is app is a life saver! It's easy to use and not complicated like other apps. This is the only thing that has helped me resize my pictures, and for that, thank you developers!! -Hillina_HabeshaGirl Do you have iOS Wallpaper trouble still? Now you can resize photo to fit screen with 'Background Optimizer for iPhone and iPad'. Now you can make your own awesome wallpapers easily! Main Features: * Two Layer Image * Save the image for Apple Watch(only available on iPhone) * Transparent Widget(only available on iPhone) * Image Move/Resize/Rotate * Save the image of Reduce Motion On/Off * Blur Effect(Border/Normal/Both) * Background Color palette and eyedropper * Awesome Pattern Filters * Barcode Generation * Help Center * Extract the image of video * All devices support * Share the image/video file from another app. Save Option: Perspective Zoom: On - Save the image for the parallax effect Perspective Zoom: Off - Save the image as you see

About

안찰칵

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
Read full description

안찰칵은 셔터음 없이 사진과 동영상을 찍는 무음 카메라입니다. 수업이나 회의에서 판서와 자료를 기록할 때, 공연장과 도서관에서, 잠든 아이나 반려동물 곁에서 — 셔터음이 방해가 되는 모든 순간을 위해 만들었습니다. 주요 기능 • 항상 무음 — 무음 모드 전환도 볼륨 조절도 필요 없습니다. • 동영상도 녹화음 없이 — 녹화 시작음과 종료음이 나지 않습니다. 영상의 소리는 정상적으로 녹음됩니다. • 셀카도 무음으로 — 셀카 모드를 추가했습니다. 보이는 모습 그대로 저장됩니다. • 아이패드에서도 — 가로로 세워 두어도, 세로로 들어도 화면이 따라 돕니다. • 무음이어도 확실한 촬영 피드백 — 사진은 화면 블링크와 햅틱으로, 동영상은 빨간 점과 경과 시간으로 알려줍니다. • 사진 비율 선택 — 4:3, 1:1, 16:9, Full. 화면에 보이는 그대로 저장됩니다. • 자연스러운 줌 — 기본 카메라처럼 렌즈를 자동 전환하며 0.5x부터 부드럽게. 녹화 중에도 됩니다. • 뷰파인더를 가리지 않는 미니멀 UI. 개인정보 촬영한 사진과 동영상은 회원님 기기의 사진 보관함에만 저장되며, 앱이 서버로 보내지 않습니다. 계정도 회원가입도 없습니다. 안내 동의 없이 타인을 촬영하는 행위는 법적 처벌 대상이 될 수 있습니다.

Screenshots

Wallpaper Optimizer(WO)4 screens
안찰칵4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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

Scorecard6 real differences · 2 level
Wallpaper Optimizer(WO) versus 안찰칵: the parameters behind the verdict, then further details
ParameterWallpaper Optimizer(WO)안찰칵
Price$2.99Free — better
Positive reviews57.6% of reviews100.0% of reviews — better
Update frequencyFortnightlyEvery 4 days — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaidAd-supported — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.3 — better17.2
Further details — not scored
Size11 MB10 MB
Age rating4+4+
DeveloperKhunG SystemBo Hyeon Seo

Customer experience

Wallpaper Optimizer(WO)

Written reviews33 reviews
Positive57.6%
Neutral9.1%
Negative33.3%

안찰칵

Written reviews7 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Wallpaper Optimizer(WO)

No in-app purchases

None

안찰칵

No in-app purchases

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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