This study aims to investigate the STEM approach's effect on data literacy through simple technology on the theory of spring vibration. The research method used a quasi-experimental design with one group pretest posttest design. The study was conducted in class X MIA 2 MAN 1 Yogyakarta with 26 students. Data collection used pretest and posttest scores as measurement of data literacy. Based on data analysis results, this study obtained an enhancement in data literacy abilities. It can be seen in the N-gain test result. The results showed that 54% of students had data literacy in the high category, 42% in the medium category, and 4% in a low category. This study shows that there is an increase in student data literacy abilities after they are learning with the STEM approach through simple technology.