ConclusionsThe chatbot was useful in screening for the presence and severityof anxiety and depressive symptoms. Although anxiety and depressive symptoms were not significantly reduced, there weresignificant reductions in work-related burnout on follow-upself-assessments, thus suggesting the potential effectiveness ofVickybot. Emergency situations were accurately identified andprompt interventions with successful outcomes were provided.Subjective perceptions of use (acceptability, usability, andsatisfaction) were high, in contrast to low objective-use metrics(completion, adherence, compliance, and engagement), and thefeasibility of the intervention was moderate. Our results arepromising but suggest the need to adapt and enhance thesmartphone-based solution to improve engagement. Finally, aconsensus on how to report user engagement indicators andvalidate digital solutions, especially for chatbots, is required