iwatch5和6的区别在于cpu、芯片、血氧传感器、亮度、实时高度计五个方面:区别1:cpu,iwatch6的cpu比iwatch5的效率高20%。区别2:芯片,iwatch5没有设计U1芯片,iwatch6设计了U1芯片,可以精确指示目标所在位置。区别3:血氧传感器,iwatch5没有血氧传感器,iwatch6设计有血氧传感器,支持血氧检测。区别4:亮度,iwatch6比iwatch5都调到最亮程度,iwatch6的亮度更好。区别5:实时的高度计,iwatch5是通过gps定位的,iwatch6使用气压高度计,更加精准