The KATSEYE Official Lightstick app is designed specifically for fans using the KATSEYE light stick, offering various features to enhance concert experiences. Key functionalities include Concert Mode, which syncs the light stick with concert seat information for a synchronized light show, and Self Mode, allowing users to customize light stick colors directly from their smartphones. The app also provides a battery level check feature, ensuring users are prepared for events.

To connect the light stick to the app, users need to enable Bluetooth and, in some cases, GPS on their smartphones. The app requires access to device storage, phone status, camera, GPS, and Bluetooth to function effectively. Prior to attending a concert, users must input their seat information and ensure the light stick is set to Concert Mode for optimal performance. This app is essential for an immersive concert experience.