Happy Sad Emoji Keyboard Background is a personalization app for Android devices that provides users with a variety of keyboard themes to choose from. The app is free to download and offers over 3,000 colorful themes to personalize your device. Happy Sad Emoji Keyboard Background also supports over 150 languages, making it accessible to a wide range of users.

One of the app's standout features is its cloud prediction, which enhances next word prediction and other predictions through cloud computing. It also includes a clipboard for multiple fast copy and paste, customizable keyboard color, wallpaper, and layout, input thousands of Emojis, Dictionaries, GIFs, Emoticons, and stickers anywhere conveniently, and contextual prediction. The app is compatible with almost all Android phones, and its developers have promised not to collect users' personal information to ensure privacy and security.