The goal of this two-armed randomised controlled trial is to evaluate a psychosocial self-management mobile app providing bereavement support to adolescents in grief. The main questions it aims to answer are: 1. How do adolescents in grief interact with and use the app? 2. How do bereaved adolescents perceive the usability of the app? 3. Is the intervention feasible? 4. How is the meaningfulness of using the app perceived among adolescents in grief and what effect do the adolescents perceive it to have on their grieving process and everyday life? 5. Does access to the app affect symptoms of grief, complicated grief, post-traumatic stress and depression among bereaved adolescents? Participants will: * Test the app (intervention group) or a website containing (control group) psychoeducation for 2 months * Fill out online questionnaires regarding their mental health (baseline, post, 6 months, 12 months). * Fill out an online questionnaire regarding the acceptability and usability of the app (intervention group) * Be asked to participate in narrative interviews (intervention group) Researchers will compare the intervention group with the control group to see if the app has an effect on bereaved adolescents mental health.
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Change (from baseline) in Traumatic Grief Inventory-Kids-Self report
Timeframe: 2, 6 and 12 months