Bad Apple!! Live Wallpaper is a free live wallpaper application for Android devices inspired by Touhou Project. The app is developed by lailai and falls under the Lifestyle category. It is essentially a story app that provides a live wallpaper with secondary video creations on characters from Touhou Project, which can be enjoyed by fans of the franchise. The app has been tested and reported to work smoothly on various models, including Xperia, Galaxy S, and Nexus S, among others. However, it may not work on XOOM.

The app is known to consume battery life, but it has a power-saving mode that stops the wallpaper display when not in use. The app is not a normal application but a live wallpaper, and thus, it requires setting up as live wallpaper rather than starting the app. The installation file is large, and it may take some time to download and install. The app offers a unique experience to fans of Touhou Project and can be downloaded from the Google Play Store.