| Case Size | 40mm / 44mm aluminium (midnight, starlight) | 42mm / 46mm, aluminium (jet black, rose gold, silver, space gray) or polished titanium (natural, gold, slate) |
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| Display | Always-On display; cover glass 4x more resistant to cracks than previous generation (Ion-X) | Ion-X glass on aluminium models (2x more scratch resistant), sapphire crystal on titanium models |
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| Chipset | Apple S10 | — |
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| Battery | Up to 18 hours; 15 minutes of fast charging adds up to 8 hours, about 80% in 45 minutes | Up to 24 hours; 15 minutes of fast charging adds up to 8 hours |
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| Health Sensors | Heart rate, wrist temperature sensing, sleep score, sleep apnea notifications, retrospective ovulation estimates | Optical heart sensor with hypertension notifications, sleep score, ECG, blood oxygen, sleep apnea notifications, wrist temperature |
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| Connectivity | 5G cellular models | 5G cellular models with redesigned antenna |
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| OS | watchOS 26 (requires iPhone 11 or later with iOS 26) | watchOS 26 (requires iPhone 11 or later with iOS 26) |
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