The Apple Watch Series 12 is now available, three years after the Series 9. In that time, Apple has introduced a thinner design, larger displays, faster charging, new water sensors, and a substantially more capable health sensing system. Is that enough to justify replacing a Series 9? Apple discontinued the Series 9 in 2024. The older watch still supports watchOS 27 , so the decision comes down to the hardware and features you would gain. Here are the key differences between the Apple Watch Series 9 and Series 12: Apple Watch Series 9 Apple Watch Series 12
42mm and 46mm cases, 9.7mm thick in aluminum and titanium; ceramic cases are 9.85mm thick
Titanium : Radiant Gold and Natural Ceramic : Pearl White and Night Blue
Ion-X front glass on aluminum models; sapphire crystal on stainless steel models
Ceramic Shield 2 on aluminum models; sapphire crystal on titanium and ceramic models
41mm : 904 sq mm display area 45mm : 1,143 sq mm display area
42mm : 970 sq mm display area 46mm : 1,196 sq mm display area
LTPO3 wide-angle OLED Always-On Retina display with a 1Hz refresh rate, enabling a live ticking seconds hand on select watch faces
Recovery HRV and overall HRV, measured up to 24 times more frequently
Audio Intelligence, including Sound Recognition, faster Shazam, Live Rewind, and Siri Recap
Up to 18 hours of normal use; up to 36 hours in Low Power Mode
Up to 24 hours of normal use; up to 38 hours in Low Power Mode
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