This document summarizes a study on the influence of the quiz application Quizizz on students' mastery of the present perfect tense. The study involved students at SMKN 1 Natar high school in South Lampung, Indonesia. Tests were given to experimental and control groups before and after the experimental group used Quizizz activities in their English lessons. Statistical analysis using SPSS was used to analyze the data and determine if there was a significant influence of Quizizz on present perfect tense mastery. The results of this study can provide information on whether Quizizz is effective for teaching grammar.