This study explores the effect of using Quizizz on students’ vocabulary mastery at SMKN 1 Pekanbaru. A pre-experimental one-group pre-test and post-test design was applied to 37 students of class XI MPLB 3. Students were treated over four sessions using a scientific approach in Merdeka Curriculum, with Quizizz applied as an interactive learning and assessment tool. The vocabulary test focused…