Background: Worldwide, the #covid19 pandemic contributed to further gaps in mental health care, particularly in low- and middle-income countries such as Vietnam, where care is inaccessible for 90% of those who need it. There has subsequently been a considerable increase in the use of digital mental health interventions such as smartphone apps. Presently, the evidence for such interventions is limited, especially in cases in which the interventions have been adapted from evidence-based in-person formats. Implementation science aims to promote the incorporation of scientific findings into practice. A key determinant of implementation success is an intervention’s #usability. Hurdles to #usability include an intervention being too confusing or time-intensive to use. Facilitators include incorporating a greater number of engagement features and integrating human support. Objective: The aim of this implementation science #feasibility study was to describe the challenges and mitigation strategies used in the development, #usability testing, and implementation of a digital depression intervention (VMood smartphone app) developed in Vietnam. VMood was adapted from an evidence-based in-person intervention originally developed in Canada that is grounded in principles of cognitive behavioral therapy with supportive coaching by a lay health or social services worker. The research team is currently testing the effectiveness and cost-effectiveness of VMood in a randomized controlled trial across 8 provinces in Vietnam informed by the results of this #feasibility assessment. Methods: This mixed methods #feasibility study was organized using an implementation outcome framework focused on acceptability, adoption, appropriateness, and #feasibility. This study involved three data collection components: (1) #usability testing (interviews and focus groups with app user and provider participants who tested VMood in 1 Vietnamese province), (2) app metrics (from the early phase of the randomized controlled trial in the same province but from different municipalities), and (3) discourse data (notes from various team meetings, communications, and reports on VMood’s development and implementation). Qualitative data were analyzed using thematic content analysis. App use data were analyzed using basic descriptive statistics. Results: The findings of the 3 data components showed that there were seven main challenges: (1) challenges with recruitment and uptake of the app, (2) challenges with use and engagement, (3) screening challenges, (4) digital divide, (5) limitations to digital applications for mental health, (6) technological challenges, and (7) funding and policy constraints. Various solutions to help mitigate the challenges were used by the team. Conclusions: The findings contribute important evidence on the challenges to the development and #feasibility assessment of a digital depression app adapted from an in-person intervention in Vietnam. The findings have applicability for others looking to develop and implement digital interventions in similar contexts, serving as a unique opportunity to share the lessons learned regarding the development and testing process.

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