Table 3.

List of core themes and relative example quotes derived from the qualitative analysis of participants’ post-intervention interviews.

Themes groups	Themes	Example quote
Positive feedback	Simplicity of food-intake reporting	I prefer vB as it is more precise regarding calories... and food quantities ... [Parent, P6]
	Conscious food purchases	We have changed our habits at the store... we do not care much about special offers anymore. [Parent, P3]
	Family awareness of dietary choices	I realized that I used to prepare French fries or fried food too often... [Parent, P6]
	Influence on meals preparation	Mom and daddy checked the app to decide what to prepare for lunch and dinner... [Child, P3]
	Children’s goal-driven motivation	I use the app more if there is the bracelet... I want to achieve the goal 100% ... [Child, P2]
Negative feedback	Difficulties with food portion assessment	It was not easy sometimes to know the portion of food consumed... [Parent, P5]
	Poor engagement with secondary app’s features	We did not understand much the functionality “shopping list” so we never used it [Parent and child, P1]
	Problems with children’s use of wearable trackers	I could not wear the bracelet during some of the sport activities at school, it was forbidden [Child, P2]
Recommendations for improvement	Visual display of calories intake or burnt	It would be interesting to have the app showing information about burned calories or intake [Parent, P4]
	Support to food categorization	It would be good to get some app’s help on categorization of some particular foods, like “polenta” [Parent, P6]
	Healthy recipes provision	I would like to receive suggestions on recipes for next meals, as some days it is not easy to find new ideas for meals preparation [Parent, P5]