The main objective of this research was to improve the level of understanding of the usage of vowels and numbers for children over 4 years of age in the Juana Alarco de Dammert Nursery School in Trujillo through an educational mobile application that is composed of the unit development platform, monodevelopment, Andriod Studio, Vuforia using the programming language C# that was made based on the development methodology of extreme software programming. The research design is a pre-experimental experiment grade which was composed of 10 children over the age of 4 of the nursery school and was used as a method of data analysis Student T test. In addition, with the implemented application it was possible to increase the level of academic performance of vowel usage by 27.60% and the use of numbers by 22.60%. It was concluded that with the implementation of the educational mobile application of augmented reality, the level of understanding of vowel usage and numbers had improved in the Juana Alarco de Dammart nursery school children.