Watch Ultra 4

Released September 2026

The Apple Watch Ultra 4 is Apple's 49 mm titanium sports and adventure watch for 2026, suited to iPhone owners who run, hike or dive and want dual-frequency GPS, satellite SOS and battery life beyond two days.

Model history · 2 models, 2025–2026

2025Watch Ultra 3 Compare
2026Watch Ultra 4

Type: Smart and sports
Sizes: 49 mm
Movement: –
Power reserve: –
Display: LTPO OLED
Battery: 50 h
Water: 100 m
GPS: Dual-band
Weight: 63 g

What reviewers say

Reviewers agree it is a solid upgrade, with more accurate continuous heart rate tracking, longer battery life and a useful new daily Readiness score. DC Rainmaker called its heart rate sensor Apple's best yet but noted early bugs with Readiness values; Tom's Guide's main complaint was the unchanged screen and design.

From dcrainmaker.com and tomsguide.com

Specifications

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Display

Case sizes: 49 mm
Panel: LTPO OLED
Peak brightness: 3,000 nits
Always-on display: Yes
Display detail: Always-On Retina display with wide-angle OLEDs and LTPO3; 1Hz refresh; 422 x 514 pixels at 326 ppi; 1,245 sq mm display area; 1 nit minimum brightness; Night Mode for Ultra watch faces
Screen protection: Flat sapphire crystal front

Health and fitness

ECG: Yes
Blood oxygen: Yes
Skin temperature: Yes
Sleep apnoea alerts: Yes
High blood pressure alerts: Yes
Body composition: No
Fall detection: Yes
Crash detection: Yes
GPS: Dual-band (L1 and L5)
Water resistance: 100 m
Sensors: Health Sensing System with third-generation electrical heart sensor, always-on optical heart sensor, blood oxygen sensor and temperature sensor; depth gauge to 40 m; water temperature sensor; compass; always-on altimeter (–500 m to 9,000 m); high-g accelerometer; high dynamic range gyroscope; ambient light sensor
Health features: Readiness app; Vitals app (heart rate, respiratory rate, wrist temperature, blood oxygen, sleep duration and HRV); Recovery HRV; high-frequency background heart rate tracking; ECG app; Blood Oxygen app; irregular rhythm notifications; high and low heart rate notifications; hypertension notifications; sleep apnoea notifications; sleep stages and sleep score; Cycle Tracking with fertile window and retrospective ovulation estimates, perimenopause and menopause support; Medications; Mindfulness; Noise
Fitness features: Customisable Action button with Precision Start; custom workouts; Training Load and Workout Effort; customisable heart rate zones; VO2 max; Race Route; Pacer; cadence, stride length, ground contact time, vertical oscillation and running power; multisport workouts; offline maps with custom route creation; elevation alerts; Backtrack; swimming with water temperature; recreational diving to 40 m with Depth app and third-party dive computer apps; cycling with power meters; GymKit
Safety features: Emergency SOS and Find My via satellite; Emergency SOS; international emergency calling; Siren; Fall Detection; Crash Detection; Check In; Backtrack; Last Emergency Call Availability Waypoint; torch; noise monitoring

Battery and connections

Battery life (maker's claim): Up to 50 hours
In low-power mode: Up to 84 hours
Mobile data option: Yes
Works with: iPhone
Chip: S11
Storage: 64 GB
Battery life detail: Up to 50 hours of normal use; up to 84 hours in Low Power Mode; up to 18 hours of outdoor workout, 25 hours in Extended Workout and 45 hours in Max Extended Workout
Charging: Fast charging to 80% in about 45 minutes; 15 minutes for up to 18 hours of normal use; 5 minutes for up to 10 hours of sleep tracking
Connectivity: GPS + Cellular only (model A3579) with 5G RedCap and LTE; satellite communications; Wi-Fi 4 (802.11n) at 2.4GHz and 5GHz; Bluetooth 5.3; second-generation Ultra Wideband chip; NFC for Apple Pay; precision dual-frequency GPS (GPS, Galileo, QZSS and BeiDou)

Design

Weight (lightest version): 63 g
Software: watchOS
Case materials: Grade 5 titanium case (100% recycled titanium) with ceramic and zirconia back; water resistant to 100 m (ISO 22810:2010); EN13319 recreational diving to 40 m; IP6X dust resistant; tested to MIL-STD 810H
Size: 49 x 44 x 12 mm; 63.0 g (natural) or 63.1 g (black)
Bands: Fits 130–210 mm wrists
Colours: Natural or Black titanium
In the box: Apple Watch Ultra 4, strap, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)

Pros and cons

Pros

Up to 50 hours of normal use, 84 hours in Low Power Mode and 45 hours of GPS workout tracking in Max Extended Workout
Dual-frequency (L1 and L5) GPS and Emergency SOS and Find My via satellite
3,000-nit display under a flat sapphire front; 100 m water resistance and EN13319 dive certification to 40 m

Cons

One size only, 49 mm and 63 g
Works only with an iPhone

Closest rivals

Model	Type	Sizes	Movement	Power reserve	Display	Battery	Water	GPS	Weight	Released
AppleWatch Ultra 3	Smart and sports	49 mm	–	–	LTPO OLED	42 h	100 m	Dual-band	61.6 g	Sept 2025
SamsungGalaxy Watch Ultra2	Smart and sports	47 mm	–	–	OLED	60 h	100 m	Dual-band	61.5 g	Aug 2026
AppleWatch Ultra 2	Smart and sports	49 mm	–	–	LTPO OLED	36 h	100 m	Dual-band	61.4 g	Sept 2023