The research is aimed at determining how mobile app usability affects retail customer experience and purchase intention in Delhi. As retail shopping via mobile applications gains popularity, it is important to have knowledge of the effects of usability on customer perceptions and behavioral intentions. An online survey-based survey design was used, in which 240 active users of retail apps completed a structured online survey. Constructs that were measured were usability of mobile apps, customer experience, and purchase intention, which were measured using Likert-scale questions. The reliability was ensured by Cronbach Alpha values exceeding 0.80, and validity was ensured by the factor analysis. Descriptive statistics revealed that the highest ratings of the users were on the app usability (Mean = 4.10), customer experience (Mean = 4.00) and purchase intention (Mean = 3.90). The correlation analysis showed that there were positive significant relationships between usability and customer experience (r = 0.68, p < 0.001) and usability and purchase intention (r = 0.62, p < 0.001). The use of usability as an influential predictor of customer experience and purchase intention was validated using regression analyses. The results can be used to conclude that enhancing the usability of the apps can lead to more customer satisfaction and a higher chance of purchases. The above findings can guide app developers in retailing to maximize user experience.