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Apple Watch Ultra 4 vs Apple Watch Series 12 comparison

 Compare Apple Watch Ultra 4
Apple Watch Ultra 4
Compare Apple Watch Series 12
Apple Watch Series 12
key specs
Display Size49mm46mm
Dial ShapeRectangleRectangle
Display TypeOLED RetinaOLED Retina
Ideal ForUnisexUnisex
general
BrandAppleApple
ModelWatch Ultra 4Watch Series 12
Release dateSeptember 9, 2026September 9, 2026
Dial ShapeRectangleRectangle
UsageRegular, SportsRegular, Sports
Ideal ForUnisexUnisex
product details
SensorHealth Sensing System, optical and electrical heart sensors, blood oxygen sensor, temperature sensor, depth gauge, water temperature sensor, compass, always-on altimeter, high-g accelerometer, gyroscope, ambient light sensorNew optical and electrical heart sensors, optical heart sensor
Battery TypeRechargeable lithium-ion-
Battery Lifeup to 50 hours24 hours
Charger TypeMagnetic charging portMagnetic charging port
Rechargeable BatteryYesYes
Compatible Device-iPhone 11 or later, or iPhone SE (2nd generation or later), with iOS 27 or later
Other Features-Readiness score, Siri AI
connectivity features
Call FunctionYesYes
BluetoothYesYes
Wi-FiYesYes
GPSYesYes
platform and storage features
Operating SystemwatchOS 27watchOS 27
Processor NameApple S11 chipApple S11 chip
Internal Memory64GB-
camera and display features
Display Resolution422 × 514416 × 496
Display Size49mm46mm
Display TypeOLED RetinaOLED Retina
Scratch ResistantSapphire crystalCeramic Shield 2 on aluminium models
Other Display Features3000 nits peak brightness, 1 nit minimum brightness, 1Hz refresh rate, 326ppi, Night ModeUp to 2,000 nits brightness, LTPO3, Always-On display
fitness and watch functions
Step CountYesYes
Calorie CountYesYes
Heart Rate MonitorYesYes
AltimeterYesYes
CompassYesYes
CalendarYesYes
Alarm ClockYesYes
ChronographYesYes
Date & Time DisplayYesYes
LanguageEnglishEnglish
Number of Buttons32
Other Fitness FeaturesReadiness score, HRV, heart rate zones, Training Load, Workout Effort, VO2 max, custom workouts, race route, Pacer, cadence, stride length, running power, multisport workouts, cycling metrics, swimming metrics, diving, depth gauge, water temperature, GPS, elevation tracking, Backtrack and offline mapsECG, sleep tracking, sleep score, sleep apnoea notifications, heart rate notifications, HRV, readiness score, VO2 max, heart rate zones, Training Load, workout tracking, cycle tracking, step tracking, GPS, elevation tracking
audio and video features
SpeakerYesYes
Gesture ControlYesYes
MicrophoneYesYes
Voice ControlSiri AISiri AI
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