Apple Watch Ultra 4 / Apple Watch SE 3 (44 mm, GPS)

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

Apple Watch SE 3 (44 mm, GPS): 44 mm GPS · aluminium case (Midnight / Starlight)

SpecificationApple Watch Ultra 4Apple Watch SE 3 (44 mm, GPS)
Release year20262025
Announcement / availability9 / 18 September 2026 Apple—
CaseGrade 5 titanium; sapphire front crystal Apple44 mm aluminium; 44 × 38 × 10.7 mm

A 40 mm version also exists with different size, display and battery values.

Apple
Size49 × 44 × 12 mm Apple—
WeightNatural titanium case 63 g Apple32.9 g (GPS) Apple
DisplayLTPO3 OLED; 422 × 514 AppleAlways-On Retina, LTPO OLED; 368 × 448 pixels, 977 mm², 326 ppi

Because the LTPO panel can lower its refresh rate, the display keeps showing the time and notifications with the wrist down; this is the first SE with Always-On.

Apple
Brightness1 nit minimum; 3000 nits peak Apple1,000 nits peak; 2 nits minimum Apple
ChipS11; dual-core 64-bit Apple—
Storage64 GB Apple64 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 AppleWi-Fi 4 (802.11n, 2.4 GHz only); Bluetooth 5.3 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% AppleFast charging: about 80% in 45 minutes; 15 minutes gives up to 8 hours of use

Times are with the included Apple Watch Magnetic Fast Charger to USB-C Cable; no adapter is included.

Apple
Water / dust100 m rating; IP6X Apple—
Diving limitRecreational diving to 40 m Apple—
Phone compatibilityiPhone 11 / SE 2 or later; iOS 27+ Apple—
Announcement—September 9, 2025; on sale from September 19, 2025 Apple
Front glass—Ion-X glass

Apple claims 4x better crack resistance than the SE 2.

Apple
Processor—Apple S10 SiP; 64-bit dual-core processor, 4-core Neural Engine

The S10 enables the Always-On display, double tap and wrist flick gestures, on-device Siri and fast charging.

Apple
Sensors—Second-generation optical heart sensor, temperature sensor, compass, always-on altimeter, high-g accelerometer, high dynamic range gyroscope, ambient light sensor

There is no ECG or blood oxygen sensor. The temperature sensor is not intended for medical use.

Apple
Health features—Heart rate and rhythm notifications, sleep apnoea notifications, sleep stages and sleep score, cycle tracking

Feature availability varies by country.

Apple
Gestures—Double tap; wrist flick (watchOS 26)

Wrist flick dismisses notifications and calls, silences alarms and returns to the watch face with one hand.

Apple
Speaker—Yes; can play music and podcasts Apple
Water resistance—50 metres (ISO 22810:2010); swimproof Apple
Location—L1 GPS, GLONASS, Galileo, QZSS, BeiDou

This is single-frequency (L1) GPS; position can drift under trees and between tall buildings.

Apple
Battery life—Up to 18 hours of normal use; up to 32 hours in Low Power Mode

In Apple's test the watch stays connected to an iPhone over Bluetooth throughout; results vary with use and settings.

Apple
Compatibility—iPhone 11 or later, iPhone SE (2nd generation) or later Apple
Colour options—Midnight or Starlight aluminium case Apple