Mobile app design directly impacts user retention through its usability and visual appeal. A well-designed user interface that is intuitive and aesthetically pleasing enhances the overall customer experience, encouraging users to return. Features like personalized content and seamless navigation increase engagement while minimizing frustrations. Regular updates and feature enhancements keep users interested and prevent them from abandoning the app. Additionally, understanding user feedback to iterate designs can significantly influence retention rates, making app design a critical factor for long-term success.