Nursing students have difficulty interpreting ECG rhythms. The current classroom environment often lacks application and practice opportunities, and as a result, students struggle with identification of ECG rhythms at the patient's bedside. The purpose of this study was to determine the effectiveness of a 3D app on nursing student's ECG level of knowledge as evidenced by exam performance. A gap in the literature exists examining 3D app technology used as a teaching methodology for nursing students learning ECG interpretation. A quasi-experimental research design consisting of one experimental group and one control group was implemented. The instrument used in this study included an identical 10-item pretest and posttest. Paired or dependent t-tests and an independent t-test were used for the statistical analysis. The pretest and posttest allowed the researcher to identify the differences in learning outcomes between these two groups. The statistical significance was set at p < .05. The findings from this study did not show a statistical difference in learning from 3D app technology for ECG knowledge. Both the experimental and control groups posttest mean scores increased.