Apple Watch Ultra 4 / Apple Watch Ultra 3

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

Apple Watch Ultra 3: 49 mm titanium case, GPS + Cellular (A3281); natural or black finish. Ultra 2 and Ultra 4 are separate models.

SpecificationApple Watch Ultra 4Apple Watch Ultra 3
Release year20262025
Announcement / availability9 / 18 September 2026 Apple—
CaseGrade 5 titanium; sapphire front crystal Apple49 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
Size49 × 44 × 12 mm Apple—
WeightNatural titanium case 63 g Apple—
DisplayLTPO3 OLED; 422 × 514 AppleAlways-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
Brightness1 nit minimum; 3000 nits peak Apple—
ChipS11; dual-core 64-bit Apple—
Storage64 GB Apple—
Health sensorsElectrical/optical heart; blood oxygen; temperature Apple—
Outdoor sensorsDepth, water temperature, compass, altimeter Apple—
PositioningPrecision dual-frequency GNSS Apple—
WirelessWi-Fi 4, 2.4/5 GHz; Bluetooth 5.3; UWB Apple—
CellularA3579: 5G RedCap and LTE Apple—
Manufacturer battery testUp to 50 hours normal use; 84 in Low Power Mode Apple—
ChargingAbout 45 minutes to 80% Apple—
Water / dust100 m rating; IP6X Apple—
Diving limitRecreational diving to 40 m Apple—
Phone compatibilityiPhone 11 / SE 2 or later; iOS 27+ 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
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
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
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