The study of scientific and technological potential is an important task in determining the technological leadership of countries. There is no universal indicator for its assessment, it is common to consider a set of indirect indicators for the implementation of such studies. The paper considers the tool for assessing the S&T landscape of countries on the example of Japan and the Republic of Korea, as well as the visualization of the results, which allows to present large amounts of data in an easy-to-understand format. The paper analyzes existing methodologies for assessing the S&T landscape, including the methodology for assessing the potential for modernization of the industrial complex, technological forecasting and social change through the citation network and topic analysis, patent landscape. The collection and processing of scientific publications of the selected countries of 1,803,000 by means of software tools are considered, and a data repository is compiled. A tool for assessing the S&T landscape is presented, including its visualization in the form of a 3D graph at the scale of the scientific field and the country as a whole.