Spatial skills are one of the factors of human intelligence structure. Development of spatial skills in students is critically important for understanding the contents of engineering graphics subjects. The aim of this study was to test an Augmented Reality (AR) based applications that could influence on spatial ability of first year students from Riga Technical University (RTU). A pre- and post-test was employed using two intact classes of students which studied “Descriptive Geometry and Engineering Graphics” subject. The treatment group learnt this subject carrying out additional tasks of didactic AR based toolkit with aim to develop spatial skills during their course, while the control group had their regular course.