BTS sin internetB is a free Android application developed by Ring Inc. It falls under the Multimedia category and specifically the Music & Radio subcategory. This app provides BTS fans with a way to listen to their favorite songs offline, including the latest release, Butter.

The app is designed to be user-friendly and easy to navigate. It offers a simple interface that allows users to quickly and easily find and play their favorite BTS tracks. The app is not affiliated with any company and is meant for entertainment purposes only.

Overall, BTS sin internetB is a great option for BTS fans who want to listen to their favorite songs offline. It is easy to use and provides access to all of BTS's latest tracks, including Butter. However, it is worth noting that the app is not official and the content within is not endorsed or sponsored by any company.