Dictionaries from Russian to Tajik and from Tajik to Russian have been developed. Russian-Tajik dictionary and Tajik-Russian dictionary contain more than 100,000 words. The application works offline. Introducing a unique application for smartphones and tablets on the Android operating system - Russian-Tajik dictionary. It is not always necessary, if necessary, to explain with the speaker of the Tajik language there is a paper dictionary at hand, and it is inconvenient to carry it with you. Going