Apple Watch Ultra 4 vs Apple Watch Series 12 comparison

Show Only Differences Highlight Differences	Apple Watch Ultra 4	Apple Watch Series 12
key specs
Display Size	49mm	46mm
Dial Shape	Rectangle	Rectangle
Display Type	OLED Retina	OLED Retina
Ideal For	Unisex	Unisex
general
Brand	Apple	Apple
Model	Watch Ultra 4	Watch Series 12
Release date	September 9, 2026	September 9, 2026
Dial Shape	Rectangle	Rectangle
Usage	Regular, Sports	Regular, Sports
Ideal For	Unisex	Unisex
product details
Sensor	Health 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 sensor	New optical and electrical heart sensors, optical heart sensor
Battery Type	Rechargeable lithium-ion	-
Battery Life	up to 50 hours	24 hours
Charger Type	Magnetic charging port	Magnetic charging port
Rechargeable Battery	Yes	Yes
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 Function	Yes	Yes
Bluetooth	Yes	Yes
Wi-Fi	Yes	Yes
GPS	Yes	Yes
platform and storage features
Operating System	watchOS 27	watchOS 27
Processor Name	Apple S11 chip	Apple S11 chip
Internal Memory	64GB	-
camera and display features
Display Resolution	422 × 514	416 × 496
Display Size	49mm	46mm
Display Type	OLED Retina	OLED Retina
Scratch Resistant	Sapphire crystal	Ceramic Shield 2 on aluminium models
Other Display Features	3000 nits peak brightness, 1 nit minimum brightness, 1Hz refresh rate, 326ppi, Night Mode	Up to 2,000 nits brightness, LTPO3, Always-On display
fitness and watch functions
Step Count	Yes	Yes
Calorie Count	Yes	Yes
Heart Rate Monitor	Yes	Yes
Altimeter	Yes	Yes
Compass	Yes	Yes
Calendar	Yes	Yes
Alarm Clock	Yes	Yes
Chronograph	Yes	Yes
Date & Time Display	Yes	Yes
Language	English	English
Number of Buttons	3	2
Other Fitness Features	Readiness 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 maps	ECG, 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
Speaker	Yes	Yes
Gesture Control	Yes	Yes
Microphone	Yes	Yes
Voice Control	Siri AI	Siri AI
ratings
Overall NDTV Rating	-	Read Review
Design and comfort Rating	-
Tracking accuracy Rating	-
Companion app Rating	-
Software and ecosystem Rating	-
Battery life Rating	-

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