Urban planners must ensure that urban public spaces are enjoyable to use to create a lively city that expresses their culture and traditions and welcomes social diversity. This study aims to develop a theoretical index for assessing the livability levels in tourist districts. Therefore, a survey-based study accompanied by a literature review is used to derive criteria for livability. In addition to using the analytic hierarchy process to develop an importancebased hierarchy of criteria, mathematical analysis is applied to derive the livability index. Furthermore, one of Sharjah’s well-known public spaces, Al Qasba Tourist District, is assessed as a case study. This study discussed the main concepts and factors of livability in urban public spaces to examine the livable extent of Qasba and the significance of criteria. Results show that the current livability level in Al Qasba is less than 50%, confirming its urgent need for further urban improvement. This study explores the livability assessment criteria and their influencing parameters. Using the suggested conceptual livability index enables decision makers to assess the livability level, analyze the influencing factors, and suggest solutions to improve the overall livability levels of open public spaces.