Comparison table

Technical specifications

Ultra 2 Series 9 Series 8
Case size 49mm 45mm or 41mm 45mm or 41mm
Case finish Titanium Aluminium, Stainless Steel Aluminium, Stainless Steel
Retina display Always on Always on Always on
High and low heart rate
Irregular heart rhythm
Fall Detection
Waterproof 100m 50m 50m
Blood Oxygen app
ECG app
Chip S9 SiP S9 SiP S8 SiP
Case size
Ultra 2 49mm
Series 9 45mm or 41mm
Series 8 45mm or 41mm
Case finish
Ultra 2 Titanium
Series 9 Aluminium, Stainless Steel
Series 8 Aluminium, Stainless Steel
Retina display
Ultra 2 Always on
Series 9 Always on
Series 8 Always on
High and low heart rate
Ultra 2
Series 9
Series 8
Irregular heart rhythm
Ultra 2
Series 9
Series 8
Fall Detection
Ultra 2
Series 9
Series 8
Waterproof
Ultra 2 100m
Series 9 50m
Series 8 50m
Blood Oxygen app
Ultra 2
Series 9
Series 8
ECG app
Ultra 2
Series 9
Series 8
Chip
Ultra 2 S9 SiP
Series 9 S9 SiP
Series 8 S8 SiP

Footnote

* Blood Oxygen app measurements are not intended for medical use, including self-diagnosis or consultation with a doctor, and are only designed for general fitness and wellness purposes.

** The ECG app is available on Apple Watch Series 4 and later (not including Apple Watch SE) with the latest versions of iOS and watchOS. See apple.com/watch for compatibility details. ECG is not intended for use by people under 22 years old. With the ECG app, Apple Watch is capable of generating an ECG similar to a single-lead electrocardiogram.