TappN is an iPhone application designed to help users make decisions on where to go out by providing live music streams from DJs at various venues across different cities. The app offers a unique feature allowing users to interact with the DJs by sending comments during their live streams. Additionally, TappN enables users to conveniently place orders for food, drinks, and tickets, as well as make payments in advance for their preferred venues.

Furthermore, TappN allows users to create and share stories containing pictures, text, or videos, which can be viewed by other users. A standout feature of the app is the ability to listen to music in the background while using other applications on the phone, enhancing the overall user experience.