U CUBE is a lifestyle app developed by Cube Entertainment Inc. exclusively for iPhone users. This free app serves as the official global fan site for Cube Entertainment, providing fans with a platform for communication and engagement.

The app features several sections that cater to different aspects of fan interaction. In the "Talk" section, fans can freely communicate with each other through a bulletin board. The app also offers translation services, allowing users to translate posts into their desired language. Additionally, users can show their appreciation for posts by liking them with the heart icon.

The "Letter" section allows fans to read letters written by the artists themselves and even write letters to the artists directly. This creates a unique opportunity for fans to connect with their favorite artists on a personal level.

Fans can stay up-to-date with official announcements and notices in the "Notice" section. This includes important announcements, public broadcast notices, and event updates. Users can filter the notices by category for easy access to the information they need.

The "Media" section serves as a hub for various official content uploaded specifically for fan clubs. Fans can enjoy exclusive videos and other media content related to their favorite artists.

For fans who want to keep track of their favorite artists' schedules, the "Scheduler" section provides access to the official schedules of the artists.

U CUBE also offers a unique feature called "Badge," which allows users to earn badges by participating in various activities such as joining the official fan club, attending offline events, concerts, and public broadcasts.

Overall, U CUBE is a comprehensive lifestyle app that provides Cube Entertainment fans with a dedicated platform to connect, communicate, and engage with their favorite artists and fellow fans.