Apple Watch Ultra 2 / Apple Watch Series 8 (45 mm, GPS)

Apple Watch Ultra 2: Apple Watch Ultra 2, 49 mm titanium case, GPS + Cellular; natural (2023) and black titanium added in 2024. Band options (Alpine Loop, Trail Loop, Ocean Band, Titanium Milanese Loop) vary by size. The Apple Watch Ultra (2022) and Ultra 3 (2025) are separate models.

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 2	Apple Watch Series 8 (45 mm, GPS)
Release year	2023	2022
Case	49 mm, Grade 5 titanium; natural or black; 49 × 44 × 12 mm Weight is 61.4 g in natural and 61.8 g in black. Fits 130–210 mm wrists. Apple	—
Display	Always-On Retina LTPO2 OLED; 410 × 502 pixels, 326 ppi; 1,185 mm² display area Brightness goes up to 3,000 nits and down to 1 nit in the dark. LTPO2 lowers the refresh rate to reduce battery use in always-on mode. 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
Glass	Flat sapphire crystal front Apple	—
Chip and storage	S9 SiP (64-bit dual-core processor, 4-core Neural Engine); 64 GB The S9 SiP can process Siri requests on the device and supports the double tap gesture (tapping thumb and index finger together twice). Apple	—
Location	L1 + L5 dual-frequency GPS; GLONASS, Galileo, QZSS, BeiDou The L5 band helps reduce position errors where signals bounce, such as among tall buildings and dense trees. Apple	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
Sensors	Electrical heart sensor; third-generation optical heart sensor; temperature sensor; depth gauge; water temperature sensor; compass; always-on altimeter The electrical sensor runs the ECG app (age 22 and over). The temperature sensor is not for medical use; it supports retrospective ovulation estimates in cycle tracking. Apple	—
Diving and durability	100 m water resistance under ISO 22810:2010 (WR100); recreational scuba diving to 40 m under EN13319; IP6X under IEC 60529; MIL-STD 810H testing The depth gauge is accurate to ±1 m; Apple advises against diving below 40 m. The MIL-STD 810H tests cover altitude, temperature shock, freeze/thaw, shock and vibration. Apple	—
Cellular and wireless	4G LTE and UMTS; Wi-Fi 4 (802.11n); Bluetooth 5.3; second-generation Ultra Wideband chip Cellular use needs a carrier plan. Ultra Wideband enables precision finding of an iPhone; availability depends on the country. Apple	—
Battery and charging	Up to 36 hours in normal use and 72 hours in Low Power Mode; fast charge to 80% in about 1 hour; built-in lithium-ion The box includes a 1 m magnetic fast charger to USB-C cable; no adapter. Apple	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
Controls and safety	Customisable Action button; Digital Crown with haptic feedback; siren; Emergency SOS, fall and crash detection The Action button is also used for Precision Start, beginning a workout recording at the exact start. The siren sounds a loud alert to call for help. Apple	—
Compatibility	iPhone Xs or later, or iPhone SE (2nd generation or later), with iOS 18 or later The watch is set up and used only with an iPhone; it does not work with Android phones. Apple	Requires iPhone 8 or later with iOS 16 or later It cannot be used with Android phones. Apple
Operating conditions	On wrist –20 to 55 °C; diving 0–40 °C; altitude –500 to 9,000 m Apple	—
Chip	—	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
Health sensors	—	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
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
Connectivity	—	Wi-Fi 802.11b/g/n 2.4 and 5 GHz; Bluetooth 5.3 Apple
Storage	—	32 GB 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
Colours	—	Aluminium: Midnight, Starlight, Silver, (PRODUCT)RED Apple