Apple Watch Ultra 4 / Apple Watch Series 8 (45 mm, GPS)

Apple Watch Ultra 4: A3579; 49 mm natural titanium; translucent gray Ocean Band

Apple Watch Series 8 (45 mm, GPS): Apple Watch Series 8, 45 mm aluminium case, GPS model. The 41 mm case, GPS + Cellular and stainless steel versions are separate models; weight and screen size differ.

Specification	Apple Watch Ultra 4	Apple Watch Series 8 (45 mm, GPS)
Release year	2026	2022
Announcement / availability	9 / 18 September 2026 Apple	—
Case	Grade 5 titanium; sapphire front crystal Apple	—
Size	49 × 44 × 12 mm Apple	—
Weight	Natural titanium case 63 g Apple	—
Display	LTPO3 OLED; 422 × 514 Apple	Always-On Retina LTPO OLED; 396 × 484 pixels; 1143 sq mm display area; up to 1000 nits The LTPO panel can lower its refresh rate a lot, so the screen stays on dimmed when the wrist is down. Apple
Brightness	1 nit minimum; 3000 nits peak Apple	—
Chip	S11; dual-core 64-bit Apple	S8 SiP with 64-bit dual-core processor; W3 wireless chip; U1 (Ultra Wideband) Ultra Wideband is used for close-range location with an iPhone; availability varies by region. Apple
Storage	64 GB Apple	32 GB Apple
Health sensors	Electrical/optical heart; blood oxygen; temperature Apple	Blood oxygen sensor; electrical heart sensor (ECG app); third-generation optical heart sensor The Blood Oxygen app is not for medical use. The ECG app is not intended for people under 22 and may not be available in every country. Apple
Outdoor sensors	Depth, water temperature, compass, altimeter Apple	—
Positioning	Precision dual-frequency GNSS Apple	—
Wireless	Wi-Fi 4, 2.4/5 GHz; Bluetooth 5.3; UWB Apple	—
Cellular	A3579: 5G RedCap and LTE Apple	—
Manufacturer battery test	Up to 50 hours normal use; 84 in Low Power Mode Apple	—
Charging	About 45 minutes to 80% Apple	—
Water / dust	100 m rating; IP6X Apple	—
Diving limit	Recreational diving to 40 m Apple	—
Phone compatibility	iPhone 11 / SE 2 or later; iOS 27+ Apple	—
Motion and safety	—	High-g accelerometer up to 256 g (Fall Detection and Crash Detection); high dynamic range gyroscope; Emergency SOS; international emergency calling On the GPS model, Emergency SOS needs a nearby iPhone or Wi-Fi Calling; international emergency calling works only on cellular models. Apple
Location	—	L1 GPS, GLONASS, Galileo, QZSS and BeiDou; compass; always-on altimeter This is single-frequency (L1) GPS; drift between tall buildings can be higher than on dual-frequency models. Apple
Connectivity	—	Wi-Fi 802.11b/g/n 2.4 and 5 GHz; Bluetooth 5.3 Apple
Battery and charging	—	Up to 18 hours; built-in lithium-ion battery; USB-C magnetic fast charging cable Apple’s 18-hour figure is based on 90 time checks, 90 notifications, 45 minutes of app use and a 60-minute workout with music; sleep tracking is not part of that scenario. Apple
Durability	—	Water resistant to 50 metres under ISO 22810:2010; IP6X dust; ceramic and sapphire crystal back Suitable for shallow-water activities in a pool or the sea; not for scuba diving, waterskiing or high-velocity water. Apple
Size and weight	—	45 × 38 × 10.7 mm; aluminium GPS: 38.8 g Apple
Compatibility	—	Requires iPhone 8 or later with iOS 16 or later It cannot be used with Android phones. Apple
Colours	—	Aluminium: Midnight, Starlight, Silver, (PRODUCT)RED Apple