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The Brazilian National Cancer Institute (INCA) estimates for each year of the 2020/2022 triennium 8,460 new cases of cancer in children and adolescents in the 1-19 age group. As the second cause of death in this age group in most regions of Brazil, childhood cancer is considered a serious public health problem. Fortunately, childhood cancer is a disease with a high probability of cure if diagnosed early and treated in specialized centers. Thus, early diagnosis is an important public health strategy for treatment and is directly related to patient survival. This paper presents APPonco, a mobile application for agile and safe access to information about childhood cancer for healthcare professionals (doctors, nurses, nutritionists, etc.) and the general public (patients, families and caregivers). APPonco was a demand from a reference center in the treatment of childhood cancer in Brazil. The paper details the requirements, architecture, and development process of the application. Since 2020, APPonco is available free for Android and iOS. The software is registered in the Brazilian National Institute of Industrial Property (INPI).