User plays an active role in the evaluation phase of system development life cycle. User evaluation is essential to ensure users can use the product (system or mobile application) to solve their problems. The findings of prior study shown that users (or bus riders) faced difficulties such as long waiting time for shuttle buses in a private university in Malaysia particularly if there is bus delay due to traffic congestion. A mobile bus application (app) is proposed after the prior study is conducted. In order to gain valuable insight regarding the usability of the mobile bus app which is developed to solve the bus delay issue, user evaluation on the mobile bus app was performed in this study. Firstly, bus riders need to download the mobile bus app and test it using their mobile devices. After testing, users provided feedback using an online survey. A total of eighty four respondents participated and provided their feedback about the usability of the bus app which were measured by two constructs namely usefulness and ease of use. The results show majority of users found the bus app is usable as it is able to estimate bus arrival time and track current location of the shuttle buses. At the same time. recommendations that given in user evaluation phase help mobile application developers to improve the application in future.