RecruitingBehavioural interventionSilverCloud as a School-Based Intervention for Vulnerable YouthThe goal of this study is to test the efficacy and feasibility of a clinician-guided, app-based cognitive behavioral therapy (CBT) program, SilverCloud, as a school-based mental health intervention for vulnerable youth. An open trial of SilverCloud will be conducted to determine preliminary efficacy in this sample and inform program refinements by collecting outcome self-report assessments and conducting interviews on feasibility and acceptability. After the program and its implementation strategy are refined, we will conduct an randomized controlled trial. Adolescents who seek or are referred for mental health services through one of the study sites and screen positive for significant mental health symptoms will be randomized to receive SilverCloud or treatment as usual (TAU). Efficacy will be assessed through outcome self-reports. Feasibility and acceptability feedback will again be collected from participants, SBHC staff, and community members.