Background: The Improving Mental Health Literacy Among Children and Young People in Indonesia (IMPeTUs) intervention is a co-produced, evidence-based digital intervention designed to improve anxiety and depression focused mental health literacy and self-management among people aged 11–15 in Java, Indonesia. This study aimed to evaluate the usability, feasibility and preliminary impact of our intervention. Methods: Mixed methods, multi-site case studies based on a theory of change. Pre-and post-assessments of a range of outcomes and qualitative ...