“…Second, with the emotion scores, we could evaluate this mobile application’s user interface, interaction quality, and service environment. In specific, user interface reflects the esthetics and convenience of the web design, including the layout, readability, color scheme, font size, line spacing, logos, navigation bar and multimedia ( Walia et al, 2016 ; Cheung et al, 2017 ; Koranteng et al, 2021 ; Liu, 2022 ; Zhao and Huang, 2022 ). This study shows that the esthetics and convenience of the mobile library application have done a good job attracting users’ attention, but they failed to provide users with a happy experience.…”