| Display | Analog hybrid dial with 0.63" grayscale OLED sub-display (14504 px, 282 PPI) | Analog hybrid dial with 0.63" grayscale OLED sub-display (14504 px, 282 PPI) |
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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 | 38.4 mm (34.6 g) or 42 mm (52.6 g) stainless steel, sapphire glass, 18/20 mm FKM wristband |
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| Battery | Up to 30 days (launch claim; Withings now states up to 35 days), about 2 hours to charge | Up to 30 days (launch claim; Withings now states up to 35 days), about 2 hours to charge |
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| Water Resistance | 5 ATM (50 m) | 5 ATM (50 m) |
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| Health Sensors | Multi-wavelength PPG heart rate sensor, HDR accelerometer (no ECG, SpO2 or temperature sensor) | ECG, SpO2, TempTech 24/7 skin temperature, multi-wavelength PPG (4 wavelengths, 16 channels), HDR accelerometer |
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| Features | Heart rate notifications, respiratory scan, sleep tracking, VO2 max, menstrual cycle logging, 40+ automatic activities | AFib detection, heart rate variability, respiratory rate, menstrual cycle logging, 40+ automatic activities, VO2 max |
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| OS | HealthSense, iOS 15+ / Android 9+ compatible | HealthSense, iOS 15+ / Android 9+ compatible |
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| Colours | Black, white, rose gold and white | Black, white (38 mm); black (42 mm) |
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