We propose a conceptual model for the context of mobile applications (apps) that explains the relationship between perceived visual aesthetics, perceived visual attractiveness, and intention to download. The model predicts that the aesthetics characteristics influence users’ perceived app attractiveness and users’ intention to download the app. It further predicts an interaction effect, where users’ personality types moderate the effect of aesthetics characteristics on perceived app attractiveness. In other words: differences in aesthetics characteristics explain differences in perceived app attractiveness. However, this effect varies for different types of user personality. We explain the model’s grounding in theory, describe the design of a laboratory experiment for empirically testing the model, and explain our manipulations of the aesthetics characteristics along its classic and expressive dimensions. Besides presenting our conceptual model and describing out planned experimental design, this study encourages researchers to further investigate how aesthetics characteristics affect intention formation depending on user personality types.