Luxury Black Keyboard Theme is a free personalization app developed by Keyboard Arts Themes for Android devices. This keyboard theme is designed to work with RainbowKey, which is a separate app that must be installed to use this theme. Once installed, the theme is enabled automatically and users can enjoy a sleek, black keyboard with gold accents.

RainbowKey provides users with a variety of customization options, including the ability to create a keyboard with their favorite pictures, choose from 40+ fonts and colors, and select from 10+ built-in themes. Additionally, users can enjoy one-handed typing with swipe input, auto correction and word prediction, and a moving cursor that can be controlled by swiping on the space bar.

Overall, the Luxury Black Keyboard Theme is a stylish and functional option for those looking to personalize their Android keyboard. However, it is important to note that users must also have RainbowKey installed to use this theme.