"Bone age" app has been developed by Javier Sánchez Hernández based on the doctoral thesis of Miguel-Angel Martin (Universidad de Valladolid, Spain) and the article by S. Aja-Fernandez, R. de Luis-Garcia, M. A. Martin-Fernandez y C. Alberola-Lopez named "A Computational TW3 Classifier for Skeletal Maturity Assessment. A Computing with Words Approach", which was published at the Journal of Biomedical Informatics, Vol. 37, pp. 99-107 on year 2004. This application allows an experimented doctor evaluate by visual comparison of a radiography which is the age of a pediatric patient basing on the maturity status of his/her bones.