Fig. 4: PreventiPlaque daily tasks.

The figure illustrates three key screens of the PreventiPlaque App, showcasing its functionality to support daily health task management and adherence tracking for cardiovascular health improvement: a Daily Goal: Physical Activity (20 min): This screen highlights the user’s daily target of 20 min of physical activity. The top banner displays the goal, accompanied by a progress visualization. Below, the app shows the user’s current progress (“You have moved 0 min today”) and provides manual adjustment options using “+“ and “−“ buttons to record additional activity. b Daily medication reminder: This screen focuses on medication adherence. The interface includes a simple visual cue with icons for a pill bottle and a pill, accompanied by the question, “Have you taken your medication?” The user can log their adherence by selecting “Yes” or “No”. c Daily Smoking Goal: This screen displays the user’s smoking-related target, emphasizing abstinence with a goal of 0 cigarettes. A graphic of a cigarette and a status tracker are presented, showing progress with the message, “You smoked 0 cigarettes today.” Users can adjust their logged smoking activity using “+“ and “−“ buttons, allowing for accurate tracking.