The app helps to estimate possibilities of short-term memory of a person. This app is intended for people who work in the sphere of education and sport and are engaged in research activity. The test includes 5 stages, 10 attempts each. At each stage the quantity of visual signals is increased, from 1 at the first stage to 5 at the fifth stage. During the first 5 attempts it is offered to react to a monochrome visual signal which can be various in tone. During the second 5 attempts it is offered to react to different colour visual signals. The result of the test includes: - date and time of the test; - information about the performer; - total amount of correct responds; - total amount of incorrect responds; - proportion of correct responds to incorrect ones (%); - average value of time of reaction at each of five stages (ms); - duration of each stage (s); - percent of errors of each stage.