Skull Hellfire Keyboard Theme is a personalization app developed by Keyboard Arts Themes for Android devices. This free app allows users to customize their keyboard with a dark and fiery theme featuring skulls and flames.

To activate the keyboard theme, users need to install the latest version of RainbowKey, which is a separate app. Once installed, simply open the Skull Hellfire Keyboard Theme and it will be enabled automatically. If RainbowKey is not already installed, users will be redirected to the Google Play page to download and activate it.

RainbowKey, the main app that works in conjunction with Skull Hellfire Keyboard Theme, offers a variety of features. Users can create their own keyboard using their favorite pictures, decorate their keyboard with over 40 beautiful fonts and colors, and choose from 10 built-in themes. Additionally, RainbowKey provides 30+ stylish fonts, swipe input for one-handed typing, smart emoji prediction with over 1000 emojis, auto correction and word prediction, and the ability to move the cursor by swiping on the space bar.

Overall, Skull Hellfire Keyboard Theme is a visually striking personalization app that allows users to transform their keyboard into a dark and fiery design. With the additional features provided by RainbowKey, users can further customize their typing experience.