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Apple Watch Ultra 2 vs Apple Watch Ultra 3

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

AppleWatch Ultra 2AppleWatch Ultra 3
Overview
ReleasedSeptember 2023September 2025
Display
Case sizes49 mm49 mm
PanelLTPO OLEDLTPO OLED
Peak brightness3,000 nits3,000 nits
Always-on displayYesYes
Display detailAlways-On Retina LTPO2 OLED display; 410 x 502 pixels at 326 ppi; 1,185 sq mm display area; 1 nit minimum brightness; Night Mode with the Modular Ultra or Wayfinder watch faceAlways-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 protectionFlat sapphire crystal frontFlat sapphire crystal front
Health and fitness
ECGYesYes
Blood oxygenYesYes
Skin temperatureYesYes
Sleep apnoea alertsYesYes
High blood pressure alertsYesYes
Body compositionNoNo
Fall detectionYesYes
Crash detectionYesYes
GPSDual-band (L1 and L5)Dual-band (L1 and L5)
Water resistance100 m100 m
SensorsElectrical heart sensor; third-generation optical heart sensor; temperature sensor; depth gauge to 40 m (±1 m accuracy); water temperature sensor; compass; always-on altimeter (–500 m to 9,000 m); high-g accelerometer (up to 256 g); high dynamic range gyroscope; ambient light sensorElectrical heart sensor; third-generation optical heart sensor; blood oxygen sensor; 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 featuresVitals app (heart rate, respiratory rate, wrist temperature, blood oxygen and sleep duration); irregular rhythm notifications; high and low heart rate notifications; low cardio fitness notifications; sleep stages and sleep score; Cycle Tracking with retrospective ovulation estimates; Medications; Mindfulness with state of mind tracking; NoiseECG app; Blood Oxygen app; hypertension notifications; sleep apnoea notifications; irregular rhythm notifications; high and low heart rate notifications; Vitals app; sleep stages and sleep score; wrist temperature; Cycle Tracking with retrospective ovulation estimates; Medications; Mindfulness with state of mind tracking; Noise
Fitness featuresCustomisable Action button with Precision Start; custom workouts; Training Load; Heart Rate Zones; Race Route; Pacer; stride length, ground contact time and vertical oscillation; automatic track detection; multisport workouts; offline maps with custom route creation; elevation alerts; swimming with custom pool workouts, stroke type tracking and SWOLF; recreational diving to 40 m with the Depth app or a dive computer app from the App Store; cycling power zones and cadence with Bluetooth accessories; GymKitCustomisable Action button with Precision Start; custom workouts; Training Load and Workout Effort; customisable heart rate zones; VO2 max; Race Route; Pacer; stride length, ground contact time, cadence, power and vertical oscillation; multisport workouts; offline maps with custom route creation; elevation alerts; Backtrack; swimming with water temperature; recreational diving to 40 m with third-party dive computer apps; cycling with power meters; GymKit
Safety featuresEmergency SOS; international emergency calling; Siren; Last Emergency Call Availability Waypoint; Check In; Backtrack; torch; noise monitoringEmergency SOS and Find My via satellite; Emergency SOS; international emergency calling; Siren; Crash Detection; Fall Detection; Last Emergency Call Availability Waypoint; torch; noise monitoring; Backtrack
Battery and connections
Battery life (maker's claim)Up to 36 hoursUp to 42 hours
In low-power modeUp to 3 daysUp to 3 days
Mobile data optionYesYes
Works withiPhoneiPhone
ChipS9S10
Storage64 GB64 GB
Battery life detailMulti-day figure tested over 36 hours with 600 time checks, 180 notifications, 30 minutes of app use and a 60-minute workout with music, including 8 hours on LTE; built-in rechargeable lithium-ion batteryUp to 42 hours of normal use; up to 72 hours in Low Power Mode
ChargingFast charging to 80% in about 1 hourFast charging to 80% in about 45 minutes; 15 minutes for up to 12 hours of normal use; 5 minutes for up to 8 hours of sleep tracking
ConnectivityL1 + L5 precision dual-frequency GPS (GPS, GLONASS, Galileo, QZSS and BeiDou); 4G LTE and UMTS; Wi-Fi 4 (802.11n); Bluetooth 5.3; second-generation Ultra Wideband chip; Apple PayGPS + Cellular only (model A3281) with 5G RedCap and LTE; satellite connectivity; Wi-Fi 4 (802.11n) at 2.4GHz and 5GHz; Bluetooth 5.3; second-generation Ultra Wideband chip; NFC for Apple Pay; L1 and L5 precision dual-frequency GPS (GPS, GLONASS, Galileo, QZSS and BeiDou)
Design
Weight (lightest version)61.4 g61.6 g
SoftwarewatchOSwatchOS
Case materialsGrade 5 titanium case (95% recycled titanium) with ceramic and sapphire crystal back; water resistant to 100 m (ISO 22810:2010); EN13319 recreational scuba diving to 40 m; IP6X dust resistant; tested to MIL-STD 810HGrade 5 titanium case (100% recycled titanium) with ceramic and sapphire crystal back; water resistant to 100 m (ISO 22810:2010); EN13319 recreational diving to 40 m; IP6X dust resistant; tested to MIL-STD 810H
Size49 x 44 x 12 mm; 61.4 g (natural) or 61.8 g (black)49 x 44 x 12 mm; 61.6 g (natural) or 61.8 g (black)
BandsFits 130–210 mm wrists; Alpine Loop, Trail Loop and Ocean Band, plus Titanium Milanese Loop from September 2024Fits 130–210 mm wrists
ColoursNatural titanium; Black titanium from September 2024Natural or Black titanium
In the boxApple Watch Ultra 2, strap, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)Apple Watch Ultra 3, strap, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)

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