The 'good mobile': a mobile launcher for children to facilitate human interactions.

Children today grow up in a hybrid physical and digital environment, engaging with mobile devices from an early age, which poses a risk of negatively impacting their development. This usage often replaces social interactions and physical activities, potentially deteriorating relationships, socio-cognitive skills, and mental health. Banning device use is unrealistic, but the way children use mobiles can be altered through responsible technology. In the present study we (1) explored parental expectations regarding children's mobile applications, (2) directlyincorporated these expectations into the design of a specific application (Alphie), and (3) examined its reception through UX testing. Alphie is a child-focused application (launcher) that promotes social interaction, real-world activities, and reduces solitary screen time. Its design is informed by parental expectations and scientific data, emphasizing educational, age-appropriate, and moderately stimulating content, with parental control features. A user study with parent-child dyads showed positive experiences. Notably, the games requiring active parental involvement were also well-received, suggesting that they are effective tools for facilitating joint activities within the family. This research highlights how responsible technology can support the mental and physical health of the new generation. By linking parental expectations, application design, and user experience within a single framework, the present studyprovides a more integrative perspective on the development and evaluation of child-focused digital applications.