The development of digital twins of the urban ecosystem is gaining popularity and is the mainstream of the digital development of the territories of the world. Already today, there are domestic developments for the creation of digital twins, including the urban ecosystem. The aim of the article is to provide a theoretical description of the essence of the digital twin of a city and an overview of existing platforms for creating digital twins of an urban ecosystem to ensure the quality of life of the population. Research objectives: to identify the prerequisites for the creation of digital twins; to determine the essence of the definitional basis of the digital twin in the context of existing theoretical analogs; to characterize the conceptual foundations of creating digital twins of the urban ecosystem in Russia and the world, to identify the advantages of their development to maintain the quality of life of the population; to give an idea of the methodology for the development and functioning of digital twins of the urban ecosystem; to conduct a comparative analysis of the capabilities and functionality of digital platforms and technologies for the development of digital twins of the urban ecosystem; to conduct a comparative analysis of the existing digital twins of the urban ecosystem of the world. As a result of the study, data on existing domestic digital platforms and technologies for the development of digital twins of the urban ecosystem were obtained, their comparative analysis was carried out, advantages were identified, and the possibility of achieving technological leadership and competitiveness in this area in the world market was determined. Descriptive, analytical, and comparative methods were used as research methods. The results of the study showed that the use of digital twins of the urban ecosystem will allow municipal authorities to obtain effective levers of management, and the population -to ensure a high quality of their own life.