OK알리미톡 is a messenger app that is exclusively designed for group members, such as alumni associations, clubs, and organizations. It is integrated with the "okdongchang solution" and can be linked to the group's website or app, allowing group chats to take place. Even those who do not use the "okdongchang solution" can use this app for free.

One of the app's main features is its ability to block unnecessary conversation threads through important and general announcement functions. It also allows users to attach photos, videos, and files, as well as share posts. The app also has a phonebook synchronization feature, a friend invitation function, and a font size adjustment function. Additionally, it includes a keyword notification feature, where users can receive push notifications only for messages that contain specific words.