Adolescence (10–19 years) is a key period for developing lifelong sexual and reproductive health (SRH) behaviours, yet immigrant youth in Canada face significant barriers to accessing culturally appropriate SRH education. Existing school-based programs are inadequate, and most SRH mobile health (mHealth) apps lack inclusive, evidence-based content tailored to diverse backgrounds. To address this gap, we co-created MYPEER, a mobile app designed with immigrant adolescents using Community-Based Participatory Action Research and Human-Centred Design. Grounded in behavioural theories, MYPEER offers engaging, expert-reviewed content on puberty, contraception, STIs, gender identity, and healthy relationships. It also helps users find inclusive SRH services by filtering options based on language, accessibility, and 2SLGBTQIA+ friendliness. This study aims to assess the feasibility and acceptability of MYPEER as an SRH intervention among immigrant youth in Alberta and British Columbia, helping to inform scalable solutions for inclusive SRH education across Canada.