Table 4. Selected responses from participants during exit interviews.

Supportive feedback	Feedback suggesting improvement
The App is very user friendly and can be used by any ordinary Ugandan who can read. I liked the idea of including English and Luganda* in the App which enabled clear understanding of the questions	Data entry was dependent on only one participant within the household. This was challenging in times when the trained person was busy, sick or unavailable. I recommend training more than one person within a household as back up to ensure consistency in data entry
The App has been very useful for monitoring our symptoms and contacts and should be rolled out to the whole country	Sometimes the App would malfunction and would require a study staff to physically come over and troubleshoot. I recommend training people within the community to troubleshoot and repair the App without necessarily waiting for study staff
I appreciated the team for the quick follow up and support I got when I had to test for COVID-19	Some questions were allowing only a limited number of entries yet there would be multiple options, for example the number of movements made within the day
I was able to consult the study doctor via a phone call (which was provided in the App) on other illnesses not necessarily COVID-19 related and I was always getting support	I sometimes met so many people that capturing this information was challenging, for example at burials or social events like weddings
	I sometimes forgot to capture contact details and vehicle number plates

*Luganda is a language locally used by majority of the people in the study setting. It can easily be edited in the App to suit a different setting.