Human induced pluripotent stem (iPS) cells show potential for generating functional cardiomyocytes, comparable to human embryonic stem (ES) cells. This study compared the cardiac differentiation potential of iPS cells generated using OCT4, SOX2, NANOG, and LIN28 transgenes with ES cells. Both cell types were differentiated using embryoid body (EB) methods, and similar cardiac gene expression patterns were observed. However, pluripotency genes OCT4 and NANOG were downregulated during differentiation, with residual transgene expression blunting this downregulation in iPS cells. Cardiomyocytes from both iPS and ES cells exhibited similar proliferation rates and sarcomeric organization. Electrophysiological studies showed that iPS-derived cardiomyocytes could differentiate into nodal-, atrial-, and ventricular-like phenotypes, and responded to β-adrenergic stimulation. These findings suggest that iPS cells can differentiate into functional cardiomyocytes, making them a viable source for cardiac repair and cardiovascular research. The study highlights the potential of iPS cells as an autologous cell source for cardiac repair and as a powerful tool for cardiovascular research.Human induced pluripotent stem (iPS) cells show potential for generating functional cardiomyocytes, comparable to human embryonic stem (ES) cells. This study compared the cardiac differentiation potential of iPS cells generated using OCT4, SOX2, NANOG, and LIN28 transgenes with ES cells. Both cell types were differentiated using embryoid body (EB) methods, and similar cardiac gene expression patterns were observed. However, pluripotency genes OCT4 and NANOG were downregulated during differentiation, with residual transgene expression blunting this downregulation in iPS cells. Cardiomyocytes from both iPS and ES cells exhibited similar proliferation rates and sarcomeric organization. Electrophysiological studies showed that iPS-derived cardiomyocytes could differentiate into nodal-, atrial-, and ventricular-like phenotypes, and responded to β-adrenergic stimulation. These findings suggest that iPS cells can differentiate into functional cardiomyocytes, making them a viable source for cardiac repair and cardiovascular research. The study highlights the potential of iPS cells as an autologous cell source for cardiac repair and as a powerful tool for cardiovascular research.