Request a product

Apple Watch Series 9 vs Apple Watch Ultra 4

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

Better figure, where one is clearly better

AppleWatch Series 9AppleWatch Ultra 4
Overview
ReleasedSeptember 2023September 2026
Display
Case sizes41 mm or 45 mm49 mm
PanelLTPO OLEDLTPO OLED
Peak brightness2,000 nits3,000 nits
Always-on displayYesYes
Display detailAlways-On Retina LTPO OLED display, edge to edge; 326 ppi; up to 2,000 nits maximum and 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 (stainless steel 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 sensing; compass; always-on altimeter; high-g accelerometer; high dynamic range gyroscope; ambient light sensorHealth 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 featuresECG app; Blood Oxygen app; sleep apnoea notifications and hypertension notifications (added in later watchOS updates); irregular rhythm notifications; high and low heart rate notifications; sleep stages; Cycle Tracking with retrospective ovulation estimates; Medications; Mindfulness; NoiseReadiness 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 featuresCustom interval workouts; Heart Rate Zones; Race Route; stride length, ground contact time and vertical oscillation; automatic track detection; multisport workouts; Backtrack; pool and open-water swimming with SWOLF and automatic stroke detection; cycling Functional Threshold Power, 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; 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 featuresEmergency SOS; international emergency calling; Crash Detection; Fall DetectionEmergency 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 18 hoursUp to 50 hours
In low-power modeUp to 36 hoursUp to 84 hours
Mobile data optionYesYes
Works withiPhoneiPhone
ChipS9S11
Storage64 GB64 GB
Battery life detailBuilt-in rechargeable lithium-ion batteryUp 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
ChargingFast charging to 80% in about 45 minutesFast 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
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 with Precision Finding for iPhone 15 and later; Apple PayGPS + 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)31.9 g63 g
SoftwarewatchOSwatchOS
Case materialsAluminium or stainless steel case; water resistant to 50 m (swimproof); IP6X dust resistantGrade 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
Size41mm is 41 x 35 x 10.7 mm, 31.9 g (aluminium, GPS), 32.1 g (aluminium, GPS + Cellular) or 42.3 g (stainless steel); 45mm is 45 x 38 x 10.7 mm, 38.7 g (aluminium, GPS), 39.0 g (aluminium, GPS + Cellular) or 51.5 g (stainless steel); lightest is the 41mm aluminium GPS49 x 44 x 12 mm; 63.0 g (natural) or 63.1 g (black)
BandsFits 130–200 mm wrists (41mm) or 140–245 mm wrists (45mm)Fits 130–210 mm wrists
ColoursAluminium in Pink, Midnight, Starlight, Silver and (PRODUCT)RED; stainless steel in Gold, Silver and GraphiteNatural or Black titanium
In the boxApple Watch Series 9, strap, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)Apple Watch Ultra 4, strap, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)

More comparisons