Table 3.

Summary of usability and usage behaviour of the DoctorME app for heart failure (HF) care.

Perceived usability	- Easiness of use due to its simplicity, clarity, and simple input of data
Length of daily usage	- Average duration of a session was 5 min or less - Should not exceed 5–10 min
Frequency of monthly usage	- Eight times per month as recommended - Only when prompted to do so
Perceived benefit of the DoctorME app	- Continuous monitoring of vital signs and weight - Early warning system with quick feedback - e-learning modules - Added value at the beginning of HF; for patients with established daily care routines or stable conditions, the app may be less appealing. Individualisation of the app becomes more important
Negative influence of the DoctorME app usage	- Technical and performance problems (e.g., long loading times, complicated login) - A too high frequency of data entry
Missing functions / suggestions for improvements	- Integration of further data (e.g., further vital signs or digital devices) - More information on specific topics or modules (e-learning), e.g., nutrition, exercise - More individuality (e.g., information in e-learning depending on own health condition, possibility of further data entry in free text fields)
Physician-patient relationship / Trust in the DoctorME app	- Using the app as a stand-alone method without medical feedback is rather not supported - Some patients would always prefer direct contact with an HCP - Artificial intelligence-based medication recommendations: Trustworthy, if recommendations have been confirmed by an HCP

Legend: This information represents the key findings of the initial and post-interviews.