JOIN US, developed by Vikona Inc., is a free lifestyle app available on Android that connects people who want to drink. The app's main feature is that it allows users to find drinking buddies nearby and easily become friends with people from all over the country online. JOIN US is reset every morning at 5 am, and all users who logged in the previous day are automatically logged out and treated as "exited." The app promotes casual drinking parties, and groups can gather together and organize drinking parties, regardless of the number of people or gender. JOIN US does not promote dating or dating between men and women. Instead, it aims to provide a safe and secure environment for users to enjoy a casual drinking party with alcohol.

The app's online drinking feature allows users to connect with people all over the country/world. JOIN US sets an upper limit on the distance from the user to the other user when the app auto-matches. Users who are more than 20km away from each other will not be matched. However, after matching once, the matching will be maintained, even if the distance from the other user becomes 20km or more. JOIN US requires a Facebook ID or Apple ID to log in, and users must be at least 20 years old to use the facility.