Quizizz, a web-based assessment tool, has been innovatively used in formative assessment to activate students self-assessment. The need of timely feedback on students' performance is key point of self-assessment which most teachers rarely give due to lack of time. This study aims to present a practical way of self-assessment by making use of Quizizz features to improve student' grammar understanding. The students' improvement on grammar after self-assessment was also investigated. The data were obtained from fourteen eleventh graders of a senior high school in Bandung. The instruments employed were observation to observe how students conducted self-assessment with Quizizz, interview to find out more in-depth data on students' self-assessment practice, and test to investigate students' improvement on grammar. The result shows that students were able to do self-assessment as a result of their ability to identify their strengths and weakness prompted by Quizizz: do the first quizreceive feedbackreview-replay the quizdo the next quiz. Majority of students showed significant improvement on their grammar understanding depicted from the increasing score among three tests they took respectively. This study is expected to contribute towards the innovation of selfassessment with the use of Quizizz or other platforms by taking the process of understanding into consideration rather than relying on replacing paper-and-pencil-test with gamified quizzes.
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