Wally is a great wallpaper app. Which has thousands of HD wallpapers of different categories. App offers number of features with great UI and design. Features: 1. Maximum Download Options. 2. 4K resolutions of many wallpapers. 3. Keeps updating. 4. One click download and set wallpaper. 5. Share wallpaper directly (Image). 6. Just 3 MB of size. Copyright.