| Case Size | 40mm / 44mm aluminium (midnight, starlight) | — |
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| Display | Always-On display; cover glass 4x more resistant to cracks than previous generation (Ion-X) | Analog hybrid dial with 0.63" grayscale OLED sub-display (14504 px, 282 PPI) |
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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 30 days (launch claim; Withings now states up to 35 days), about 2 hours to charge |
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| Health Sensors | Heart rate, wrist temperature sensing, sleep score, sleep apnea notifications, retrospective ovulation estimates | Multi-wavelength PPG heart rate sensor, HDR accelerometer (no ECG, SpO2 or temperature sensor) |
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| Connectivity | 5G cellular models | — |
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| OS | watchOS 26 (requires iPhone 11 or later with iOS 26) | HealthSense, iOS 15+ / Android 9+ compatible |
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| Case | — | 37 mm (36.8 mm diameter, 9.85 mm thick), stainless steel, Gorilla Glass, 27.1 g without wristband, 18 mm FKM wristband |
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| Water Resistance | — | 5 ATM (50 m) |
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| Features | — | Heart rate notifications, respiratory scan, sleep tracking, VO2 max, menstrual cycle logging, 40+ automatic activities |
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| Colours | — | Black, white, rose gold and white |
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