Key features of a user-friendly app interface include intuitive navigation, appealing design, and responsive feedback. Intuitive navigation ensures users can easily access different sections of the app without confusion, promoting a seamless experience. An appealing design improves engagement, while consistent visual elements create familiarity. Responsive feedback, such as visual cues or notifications after actions, guides users and confirms successful interactions. Other important aspects include accessible features for individuals with disabilities and quick load times to reduce user frustration. These features collectively enhance usability and satisfaction, making an app more appealing to users.