Keyboard - Boto: Rainbow is a free personalization app for Android devices developed by Weather Radar Forecast. This app provides a variety of colorful and customizable keyboard themes, including the Rainbow theme. To use the Rainbow theme, users must download and install Boto Keyboard, which is the keyboard platform that Keyboard - Boto: Rainbow is designed to work with. The app supports over 30 languages and provides more than 1,000 fun GIFs, emojis, and emoticons. Users can personalize their keyboard themes by selecting their favorite photo from their album. The app also offers smart word prediction, which helps avoid wrong typing. Overall, Keyboard - Boto: Rainbow is a great input tool that adds more fun and color to your typing experience.