Apple Watch Ultra 3 / Apple Watch Series 8 (45 mm, GPS)

Apple Watch Ultra 3: 49 mm titanium case, GPS + Cellular (A3281); natural or black finish. Ultra 2 and Ultra 4 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 3	Apple Watch Series 8 (45 mm, GPS)
Release year	2025	2022
Case	49 mm Grade 5 titanium; natural or black finish; flat sapphire front crystal Ultra 3 is sold only as a 49 mm GPS + Cellular watch; bands fit 130–210 mm wrists. Apple	—
Display	Always-On Retina with wide-angle OLED and LTPO3; 422 × 514 pixels, 326 ppi; 1245 mm² active area; up to 3000 nits, minimum 1 nit Apple says the wide-angle OLED pixels emit light at wider angles, so the screen stays readable without fully turning the wrist. LTPO3 allows thinner borders and lets the always-on mode refresh once per second, so a seconds hand is visible without raising the wrist. The 1-nit minimum reduces glare in the dark. 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
Chip and storage	S10 SiP with 64-bit dual-core processor; 4-core Neural Engine; 64 GB storage Apple	—
Cellular and satellite	5G RedCap and LTE (A3281); international roaming; satellite connectivity for Emergency SOS, Messages and Find My RedCap is a reduced form of 5G for low-data devices such as watches. Satellite connectivity lets you call for emergency help and send short messages outside cellular coverage; Apple says Find My shares location via satellite every 15 minutes. Satellite services are free for two years from activation; Find My and Messages need a carrier plan, and availability varies by region. Apple	—
Wireless and location	Wi-Fi 4 (802.11n) 2.4 and 5 GHz; Bluetooth 5.3; second-generation Ultra Wideband; L1 and L5 dual-frequency GPS (GPS, GLONASS, Galileo, QZSS, BeiDou) Using L1 and L5 together helps reduce reflected-signal errors near tall buildings and under tree cover. Ultra Wideband availability varies by region. Apple	—
Sensors	Electrical heart sensor; third-generation optical heart sensor; blood oxygen; temperature; depth gauge and water temperature; compass; always-on altimeter; high-g accelerometer; high dynamic range gyroscope The electrical heart sensor powers the ECG app; the optical sensor drives heart rate and Apple’s hypertension notifications. Hypertension notifications passively analyse 30-day periods and are not intended for people under 22, during pregnancy or for those already diagnosed. The temperature sensor is not for medical use; the Blood Oxygen app is for wellness use. Apple	—
Durability	100 m water resistance under ISO 22810:2010; recreational scuba diving to 40 m under EN13319; IP6X dust; tested to MIL-STD 810H Diving needs a compatible third-party app; the depth gauge is accurate to ±1 m. MIL-STD 810H covers altitude, high/low temperature, temperature shock, immersion, freeze/thaw, ice and freezing rain, shock and vibration. Passing these tests does not mean the watch cannot be damaged. Apple	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
Battery and charging	Built-in rechargeable lithium-ion battery; up to 42 hours normal use, up to 72 hours in Low Power Mode; about 80% in 45 minutes; Magnetic Fast Charger to USB-C cable (1 m) Apple says 15 minutes of charging gives 12 hours of normal use and 5 minutes gives 8 hours of sleep tracking. Apple’s 80% in 45 minutes figure is based on its 20 W USB-C power adapter. Low Power Mode is rated at 20 hours of continuous outdoor workout with full GPS and heart rate. 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
Audio	Three-mic array with beamforming and wind noise mitigation; dual speakers; siren The siren helps people nearby locate a user who is lost or needs help. Apple	—
Size and weight	49 × 44 × 12 mm; 61.6 g (natural), 61.8 g (black) Apple	45 × 38 × 10.7 mm; aluminium GPS: 38.8 g Apple
Software and compatibility	watchOS 26; requires iPhone 11 or later (iPhone SE 2nd generation or later) running iOS 26 or later The watch does not pair with Android phones; setup and most features require an iPhone. Apple	—
Operating conditions	On wrist −20 to 55 °C; operating 0–35 °C; diving 0–40 °C; altitude −500 to 9000 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
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
Storage	—	32 GB 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