The relationship between the perceived usability of a beautiful interface and of an ugly interface is analyzed in this study. This study correlates the visual aesthetics of the website with perceived usability. This research is performed to know the significance of visual aesthetics on perceived usability. A website is designed with two interfaces. One interface is designed by following design guidelines with respect to usability and the other interface is designed without following guidelines. To measure the aesthetic value of these website interfaces, visual aspect questionnaire is used in classical aesthetic sense. After drawing a conclusion on aesthetic values i.e. beautiful interface and of an ugly interface, a survey performed using System Usability Scale (SUS scale) to measure the perceived usability of the beautiful interface and an ugly interface of the website. From the results we found that perceived usability of the beautiful interface is significantly higher than the ugly interface. System Usability Scale turns out sensitive to measure the beauty of the website. Results also show that the design principles have some overlapping with the visual aesthetic of the website.