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Apple Watch Series 10 vs Apple Watch Ultra 3

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

Better figure, where one is clearly better

AppleWatch Series 10AppleWatch Ultra 3
Overview
ReleasedSeptember 2024September 2025
Display
Case sizes42 mm or 46 mm49 mm
PanelLTPO OLEDLTPO OLED
Peak brightness2,000 nits3,000 nits
Always-on displayYesYes
Display detailAlways-On Retina LTPO3 display with wide-angle OLED, up to 40% brighter when viewed at an angle; 374 x 446 pixels (42mm) or 416 x 496 pixels (46mm) at 326 ppi; 970 or 1,196 sq mm display area; 1 nit minimum brightnessAlways-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 protectionIon-X front glass (aluminium cases); sapphire front crystal (titanium cases)Flat sapphire crystal front
Health and fitness
ECGYesYes
Blood oxygenYesYes
Skin temperatureYesYes
Sleep apnoea alertsYesYes
High blood pressure alertsYesYes
Body compositionNoNo
Fall detectionYesYes
Crash detectionYesYes
GPSSingle-bandDual-band (L1 and L5)
Water resistance50 m100 m
SensorsElectrical heart sensor; third-generation optical heart sensor; temperature sensor; compass; always-on altimeter; high-g accelerometer (up to 256 g); high dynamic range gyroscope; ambient light sensor; depth gauge to 6 m; water temperature 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 featuresCustom 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; pool and open-water swimming with SWOLF and automatic stroke detection; snorkelling to 6 m with the Depth app; 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; 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 18 hoursUp to 42 hours
In low-power modeUp to 36 hoursUp to 3 days
Mobile data optionYesYes
Works withiPhoneiPhone
ChipS10S10
Storage64 GB64 GB
Battery life detailAll-day figure tested over 18 hours with 300 time checks, 90 notifications, 15 minutes of app use and a 60-minute workout with music (GPS + Cellular model with 4 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 30 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 45 minutes; 15 minutes for up to 12 hours of normal use; 5 minutes for up to 8 hours of sleep tracking
ConnectivityL1 GPS, GNSS, Galileo and BeiDou; 4G LTE and UMTS (GPS + Cellular models); 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)29.3 g61.6 g
SoftwarewatchOSwatchOS
Case materials100% recycled aluminium case, or polished grade 5 titanium case (95% recycled titanium); metal and sapphire crystal back; water resistant to 50 m (ISO 22810:2010), for swimming and snorkelling; IP6X dust resistantGrade 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
Size42mm is 42 x 36 x 9.7 mm, 30 g (aluminium, GPS), 29.3 g (aluminium, GPS + Cellular) or 34.4 g (titanium); 46mm is 46 x 39 x 9.7 mm, 36.4 g (aluminium, GPS), 35.3 g (aluminium, GPS + Cellular) or 41.7 g (titanium); lightest is the 42mm aluminium GPS + Cellular49 x 44 x 12 mm; 61.6 g (natural) or 61.8 g (black)
BandsFits 130–200 mm wrists (42mm) or 140–245 mm wrists (46mm)Fits 130–210 mm wrists
ColoursAluminium in Jet Black, Rose Gold and Silver; titanium in Natural, Gold and SlateNatural or Black titanium
In the boxApple Watch Series 10, 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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