 The study evaluated the functionality and usability of a mobile app called Amor Mama, which guides and monitors patients with breast cancer undergoing radiation therapy. Only one item of the evaluation tool obtained a concordance index less than 80%, indicating that the app is suitable for use, but more studies are needed to assess its performance and quality during use. This article was authored by Flavia Oliveira de Almeida Marquez de Cruz, Edison Tosfaria, Pablo Cardolino-Gobad, and others.