The APPonco application is aimed at training and updating professionals in detecting signs and symptoms of childhood cancer, offering specialized digital content on childhood cancer through friendly and interactive computer interfaces; a Chat to exchange experiences between health professionals registered with APPonco and specialist on duty at the Peter Pan Association Pediatric Cancer Center (APP); Notifications about relevant events in the context of childhood cancer; and a Map informing the geographical distribution of professionals who use APPonco and SUS Services that offer free treatment for childhood cancer in Brazil.