Apple Watch Series 4 vs Apple Watch Ultra 2

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

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Watch Series 4 compared with Watch Ultra 2

	AppleWatch Series 4	AppleWatch Ultra 2
Overview
Released
Released	September 2018	September 2023
Display
Case sizes
Case sizes	40 mm or 44 mm	49 mm
Panel
Panel	LTPO OLED	LTPO OLED
Peak brightness
Peak brightness	1,000 nits	3,000 nits (better)
Always-on display
Always-on display	No	Yes
Display detail
Display detail	Retina LTPO OLED with Force Touch; 40mm 324 x 394 pixels and 759 sq mm; 44mm 368 x 448 pixels and 977 sq mm; display wakes by wrist raise (PhoneArena)	Always-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 protection
Screen protection	–	Flat sapphire crystal front
Health and fitness
ECG
ECG	Yes	Yes
Blood oxygen
Blood oxygen	No	Yes
Skin temperature
Skin temperature	No	Yes
Sleep apnoea alerts
Sleep apnoea alerts	No	Yes
High blood pressure alerts
High blood pressure alerts	No	Yes
Body composition
Body composition	No	No
Fall detection
Fall detection	Yes	Yes
Crash detection
Crash detection	No	Yes
GPS
GPS	Single-band	Dual-band (L1 and L5)
Water resistance
Water resistance	50 m	100 m (better)
Sensors
Sensors	Electrical and optical heart sensors; barometric altimeter; accelerometer up to 32 g-forces, improved gyroscope and ambient light sensor	Electrical 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 features
Health features	ECG capability, high and low heart-rate alerts and irregular-rhythm notifications; ECG app was not available at hardware launch and reached the UK in March 2019	Vitals 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 features
Fitness features	GPS, GLONASS, Galileo and QZSS; swimming, yoga and hiking workouts, automatic workout reminders, cadence, pace alerts and rolling mile pace in watchOS 5; GymKit	Customisable 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 features
Safety features	Hard-fall detection can call emergency services after immobility and notify emergency contacts; Emergency SOS	Emergency SOS; international emergency calling; Siren; Last Emergency Call Availability Waypoint; Check In; Backtrack; torch; noise monitoring
Battery and connections
Battery life (maker's claim)
Battery life (maker's claim)	Up to 18 hours	Up to 36 hours
In low-power mode
In low-power mode	–	Up to 3 days
Mobile data option
Mobile data option	Yes	Yes
Works with
Works with	iPhone	iPhone
Chip
Chip	S4	S9
Storage
Storage	16 GB	64 GB (better)
Battery life detail
Battery life detail	Built-in rechargeable lithium-ion battery	Multi-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
Charging
Charging	Magnetic charging cable and USB power adapter	Fast charging to 80% in about 1 hour
Connectivity
Connectivity	W3 wireless chip; Wi-Fi 802.11b/g/n at 2.4GHz; Bluetooth 5.0; cellular versions add LTE and UMTS with a compatible plan; GPS requires iPhone 5s, cellular iPhone 6, both with iOS 12 at launch	L1 + 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)
Weight (lightest version)	30.1 g (better)	61.4 g
Software
Software	watchOS	watchOS
Case materials
Case materials	Aluminium or stainless steel case; ceramic and sapphire crystal back; water resistance under ISO 22810:2010 for shallow-water swimming	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
Size
Size	40mm 40 x 34 x 10.7 mm, 30.1 g aluminium or 39.8 g steel; 44mm 44 x 38 x 10.7 mm, 36.7 g aluminium or 47.9 g steel; weights exclude bands	49 x 44 x 12 mm; 61.4 g (natural) or 61.8 g (black)
Bands
Bands	Compatible with earlier Apple Watch bands of the corresponding size; Nike+ includes Nike bands and watch faces; Hermès includes leather bands and exclusive faces. Nike+ became available 5 October 2018	Fits 130–210 mm wrists; Alpine Loop, Trail Loop and Ocean Band, plus Titanium Milanese Loop from September 2024
Colours
Colours	Silver, Space Grey and Gold aluminium; Silver, Space Black (DLC) and Gold (PVD) stainless steel; Nike+ Silver or Space Grey; Hermès polished stainless steel	Natural titanium; Black titanium from September 2024
In the box
In the box	Watch and band, magnetic charging cable and USB power adapter	Apple Watch Ultra 2, strap, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)