This study examined the potential, actual and perceived effectiveness of the Easyclass Learning Management System in developing Jordanian university students' grammar learning. A pre-/post-test, a questionnaire, and an interview schedule were used to collect data from a purposeful sample of 39 Jordanian students who were randomly divided into two groups: an experimental group (n=17) and a control group (n=22). Both groups received the same face-to-face instruction, but the experimental group received supplementary out-of-class instruction through Easyclass. The data were analyzed quantitatively and qualitatively. The findings revealed that the experimental group outperformed the control group on the post-test, while the students perceived Easyclass as highly effective in EFL grammar learning.