Whosfan is a global K-pop fandom platform that offers a range of services for fans worldwide. One of the app's main features is the Hanteo Chart, which allows users to check the sales amount and graphs of K-pop albums in real-time. Fans can also authenticate their albums with HATS cards provided when purchasing a K-pop album, which protects their favorite artist's copyright with genuine album authentication. Whosfan also offers various votings and events that global fans can participate in, such as fan ad voting, music show and award ceremony votings, and idol fansign events.

In addition to these features, Whosfan provides K-pop news through its Hanteo News section, where fans can find the fastest and most accurate K-pop idol chart news. The app also has a global fan chat service called WhooK, where fans can communicate with each other and share information on K-pop. Whosfan has various channels of K-pop artists and idols, including BTS, EXO, BLACKPINK, TWICE, and more.

Whosfan offers in-app purchases of 'Whosfan Coin' that users can use to purchase products on the app. The app requires access rights such as device ID, in-app purchase, camera, storage space, and location, but only the necessary access rights are required for using the app's services. Optional access rights require user consent, and the app can still be used without granting them. However, if the Android version is below 6.0, the app cannot individually control access rights, and the device needs to be upgraded to Android version 6.0 or higher to remove unnecessary access rights.

Overall, Whosfan is a must-have app for K-pop fans worldwide, offering a range of services such as album authentication, votings, events, K-pop news, global fan chat, and artist channels.