Table 5.

Overview of themes identified from participant interviews.

Theme	Overview
Convenience and accessibility: short bursts of on-the-go access	The app was considered a convenient and accessible means of accessing content because a phone is portable and can be used on-the-go in any location. Participants were happy to use the website and app in tandem if they were perceived to provide different value in different contexts.
Constant reminder and repetition	The app provided a constant reminder of participants’ goals and plans. This helped to maintain awareness of goals and keep them in mind. App-based reminders were typically not considered necessary on a daily or longer-term basis.
Motivational benefits of tracking	Participants reported motivational benefits from logging and tracking thoughts and behaviors via diaries, goal updates, and daily questionnaires. Use of tracking tools facilitated recognition of both progress and areas for future improvement.
Time-relevant use guided by lifestyle and routine	Usage of the app was tied to personal lifestyle and fluctuations in daily routine. Participants typically reported using the app during free moments or specific times when the app-based intervention content was most relevant, such as mealtimes.