Modern warfare, like other areas of social life, is becoming increasingly digitalised. Software and mobile devices are also widely used for military purposes. From its very beginning in 2014, the Russian- -Ukrainian conflict was linked with the introduction of innovative solutions based on new technologies The research problem is the role of mobile applications in modern armed conflict, and the objective of the research was to overview mobile applications in the Russian-Ukrainian War and outlines the impact of the use of this type of tools on military capabilities, and in general on national security. The analysis confirms the hypothesis that the usage of mobile applications in modern armed conflict is not critical to military success, but is an important factor, a multiplier of “hard” capabilities, particularly in terms of situational awareness and communications, and the security of citizens and their support for the armed forces. The subjects of research are both typically military applications (in particular in the C4ISR field, e.g. BMS systems), semi-amateur software used by the military and tools for civilians. On the Ukrainian side, they are often effect of work of volunteers, start-ups, the military itself, and are also developed under the Brave1 defence technology cluster specially established for this purpose. Mobile applications are understood as a software for mobile devices (mainly smartphones and tablets). In addition, the devices themselves can be military or publicly accessible. The author draws conclusions from the use of mobile applications in wartime conditions, as well as leans into the issue of such applications on Polish soil. The author relies on the analysis of publicly available sources (mainly Ukrainian and Russian), most of which appeared after 2022. The number of scientific publications on this topic is limited. In the author's opinion, this issue deserves further research, as in future conflicts the use of mobile applications will be widespread and with an ever-increasing impact on military operations and the protection of civilians.