Addressing issues of existing Islamic cities is paramount to the establishment of possible modern imprints of Islamicarchitecture. The visibility of mosques has been identified as a dilemma in the context of Nablus City, wheretopography raises the urban impacts of vertical growth on space perception. This paper aims to investigate thetransition of visibility from historic mosques in the old city and aims to measure the visibility of contemporary mosquesin existing urbanism. Computational tools like DecodingSpaces and Ladybug plugins are used to operate Isovist andView Percentage analysis of the context of investigated mosques. Findings showed that the horizontal distances, thelengths and heights of buildings’ façade, and the topography, altered the values of mosques visibility. The results ofthe study bring insights and suggest recommendations to the practice of urban planners, designers, and contributorsto the planning of contemporary Islamic architecture.