Population growth, urban sprawl, and excessive use of non-renewable resources have led to pressure on human and environmental resources of all kinds, which affected the stability of the environment and led to the phenomenon of global warming. Therefore, achieving sustainability requires precise indicators and standards, which can be achieved through information and communication technologies (Internet of Things). and stimulating and encouraging people to use renewable energy to ensure a better life for citizens, protect the environment, and localize the mention of sustainability Hence, we use a more accurate term, “city." Smart sustainable instead of smart city due to the necessity of smart city sustainability. The paper discusses different sustainability systems, as well as smart city standards, making a comparison between them, studying the strengths and weaknesses of each system, and coming up with the best standards to achieve a smart sustainable city.