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Background: Survivorship self-management, including adherence to survivorship care plans (SCPs), is variable, especially among adolescents and young adults (AYA). Methods:The present study describes the development of a mobile application (app) for AYA survivors (AYA STEPS), which strives to improve survivorship self-management via a combined texting self-management program (THRIVE 2.0) and an electronic survivorship care plan generator (Smart-ALACC [Smart-Adult Living After Childhood Cancer], hosted on Oncolink.org). Results: AYA STEPS was developed by modifying an existing disease management app, LSTCare. The main feature of the app is the delivery of two-way text messages that are tailored to an individual’s SCP. The messages are designed to enhance uptake of the SCP with information, strategies for adherence, motivational messages, and appointment reminders. Patients may also text back with questions. The SCP and its related text information are customized based on input of patient characteristics and treatment history, such as age, time off treatment, and type of treatment (e.g., anthracycline chemotherapy, mediastinal radiation, cranial radiation). The app also houses a copy of the complete SCP document. The SCP is generated, via patient or provider, via an electronic platform that incorporates patient demographic information, cancer diagnosis, and cancer treatments received with checklist of options. Feedback on the app was provided by AYA ages 15 to 21 via a focus group (n = 5) and interviews (n = 5), through which qualitative data were collected. AYA reported high acceptability of a mHealth intervention to improve self-care as cancer survivors, especially the inclusion of tailored content from an individualized SCP as text messages. They also reported the app as feasible to download and maintain on their phones. Conclusions: We are about to begin a RCT that will test adherence to SCP for those who received the app and the SCP versus the SCP alone. We will report details of the app and the launch of the RCT. We expect high acceptability and feasibility with measured benefit to receiving the self-management app.