Tourism has become the most widespread phenomenon in international relations: offering new destinations and new forms of arrangements, looking for new forms of organization, resources and strategies. This paper present tourism development strategies based on sustainable tourism and presents the influences of modern technologies in a sustainable way of business. Smart city concept is known as one of a sustainable way of business. Sustainable tourism is indeed a key to many global solutions and may be one of the most hopeful strategies for the global transition to sustainability. Smart cities are cities which want to develop complete and sustainable cities. Their goals are to enable higher quality of life and environmental protection. The core characteristics of smart cities, including the use of advance technology, human and social capital development and development of pro-business environments are translated into individual domain that characterize smart city strategies. Four major European cities (Barcelona, Amsterdam, London and Stockholm) and area of Istria County (Pula, Poreč, Pazin) are examined in terms of how they have so far incorporated those domains in their ongoing smart city strategies. In this paper the data are analyzedcomparatively, highlighting trends and contrasting diferences among smart city strategies.