Smart City is a concept for which no standard definition has been adopted either in theoretical researches or in empirical projects. Several definitions and classifications, different from each other, have been proposed. However, all definitions agree on the fact that a smart city is an urban space that tends to improve the daily life (work, school, etc.) of its citizens (broadly defined). This is an improvement from different points of view: social, political, economic, governmental, etc. This paper presents a case study by comparing two French cities considered smart by different classifications: Paris and Nice.