BTS홀릭 is a free Android app developed by BY STUDIO that allows BTS fans to interact with each other. Users can register their favorite member and communicate with other ARMYs. The app also allows users to upload their own photos to create a profile picture for their favorite member.

One of the unique features of the app is the weekly competition where the member with the most hearts received from other users gets their photo or gif displayed on the app's main screen. BTS홀릭 also includes a scheduling feature where users can keep track of BTS' upcoming events and receive notifications. The app has a free forum where users can share content and enjoy various BTS images and a fun puzzle game.

The app requires access to contacts, storage, and the camera for Google login, photo uploading and downloading, and taking and uploading photos. Users can manage these permissions from the app settings.

Overall, BTS홀릭 is a great social app for BTS fans to connect and share their love for the band.