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Apple Watch SE 3 vs Apple Watch Ultra 2

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

Better figure, where one is clearly better

AppleWatch SE 3AppleWatch Ultra 2
Overview
ReleasedSeptember 2025September 2023
Display
Case sizes40 mm or 44 mm49 mm
PanelLTPO OLEDLTPO OLED
Peak brightness1,000 nits3,000 nits
Always-on displayYesYes
Display detailAlways-On Retina display with OLED and LTPO; 324 x 394 pixels (40mm) or 368 x 448 pixels (44mm) at 326 ppi; 759 or 977 sq mm display area; 2 nits minimum brightnessAlways-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 face
Screen protectionIon-X front glass, 4x more crack resistant than SE 2Flat sapphire crystal front
Health and fitness
ECGNoYes
Blood oxygenNoYes
Skin temperatureYesYes
Sleep apnoea alertsYesYes
High blood pressure alertsNoYes
Body compositionNoNo
Fall detectionYesYes
Crash detectionYesYes
GPSSingle-bandDual-band (L1 and L5)
Water resistance50 m100 m
SensorsSecond-generation optical heart sensor; temperature sensor; compass; always-on altimeter; high-g accelerometer; high dynamic range gyroscope; ambient light sensorElectrical 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 sensor
Health featuresHeart Rate app; high and low heart rate notifications; irregular rhythm notifications; sleep apnoea notifications; sleep stages and sleep score; Vitals app (heart rate, respiratory rate, wrist temperature and sleep duration); Cycle Tracking with fertile window and retrospective ovulation estimates, perimenopause and menopause support; Medications; Mindfulness; NoiseVitals 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; Noise
Fitness featuresCustom workouts; Training Load; customisable heart rate zones; VO2 max; Race Route; Pacer; cadence, stride length, ground contact time, vertical oscillation and running power; automatic track detection; multisport workouts; offline maps with custom route creation; Backtrack; pool and open-water swimming with SWOLF; cycling power zones with Bluetooth accessories; GymKitCustomisable 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; GymKit
Safety featuresEmergency SOS; international emergency calling; Fall Detection; Crash Detection; Check In; Backtrack; noise monitoringEmergency SOS; international emergency calling; Siren; Last Emergency Call Availability Waypoint; Check In; Backtrack; torch; noise monitoring
Battery and connections
Battery life (maker's claim)Up to 18 hoursUp to 36 hours
In low-power modeUp to 32 hoursUp to 3 days
Mobile data optionYesYes
Works withiPhoneiPhone
ChipS10S9
Storage64 GB64 GB
Battery life detailUp to 18 hours of normal use; up to 32 hours in Low Power Mode; up to 7 hours of outdoor workoutMulti-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 battery
ChargingFast charging to 80% in about 45 minutes; 15 minutes for up to 8 hours of normal use; 8 minutes for up to 8 hours of sleep trackingFast charging to 80% in about 1 hour
ConnectivityWi-Fi 4 (802.11n) at 2.4GHz; Bluetooth 5.3; NFC for Apple Pay; L1 GPS (GLONASS, Galileo, QZSS and BeiDou); GPS + Cellular models (A3326, A3328) with 5G RedCap and LTEL1 + 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 Pay
Design
Weight (lightest version)26.3 g61.4 g
SoftwarewatchOSwatchOS
Case materials100% recycled aluminium case with nylon composite and sapphire crystal back; water resistant to 50 m (ISO 22810:2010)Grade 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 810H
Size40mm is 40 x 34 x 10.7 mm, 26.3 g (GPS) or 26.4 g (GPS + Cellular); 44mm is 44 x 38 x 10.7 mm, 32.9 g (GPS) or 33.0 g (GPS + Cellular)49 x 44 x 12 mm; 61.4 g (natural) or 61.8 g (black)
BandsFits 130–200 mm wrists (40mm) or 140–245 mm wrists (44mm)Fits 130–210 mm wrists; Alpine Loop, Trail Loop and Ocean Band, plus Titanium Milanese Loop from September 2024
ColoursMidnight or Starlight aluminiumNatural titanium; Black titanium from September 2024
In the boxApple Watch SE 3, strap, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)Apple Watch Ultra 2, strap, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)

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