Apple Watch SE 3 vs Apple Watch Ultra

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

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Watch SE 3 compared with Watch Ultra

	AppleWatch SE 3	AppleWatch Ultra
Overview
Released
Released	September 2025	September 2022
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	2,000 nits (better)
Always-on display
Always-on display	Yes	Yes
Display detail
Display detail	Always-On Retina display with OLED and LTPO; 324 x 394 pixels (40mm) or 368 x 448 pixels (44mm) at 326 ppi; 759 or 977 sq mm display area; 2 nits minimum brightness	LTPO2 OLED Always-On Retina display; 410 x 502 pixels; 1,185 sq mm display area; Night Mode on the Wayfinder face
Screen protection
Screen protection	Ion-X front glass, 4x more crack resistant than SE 2	Flat sapphire front crystal, with the case raised around its edges
Health and fitness
ECG
ECG	No	Yes
Blood oxygen
Blood oxygen	No	Yes
Skin temperature
Skin temperature	Yes	Yes
Sleep apnoea alerts
Sleep apnoea alerts	Yes	No
High blood pressure alerts
High blood pressure alerts	No	No
Body composition
Body composition	No	No
Fall detection
Fall detection	Yes	Yes
Crash detection
Crash detection	Yes	Yes
GPS
GPS	Single-band	Dual-band (L1 and L5)
Water resistance
Water resistance	50 m	100 m (better)
Sensors
Sensors	Second-generation optical heart sensor; temperature sensor; compass; always-on altimeter; high-g accelerometer; high dynamic range gyroscope; ambient light sensor	Electrical heart sensor (ECG app); blood oxygen sensor; third-generation optical heart sensor; temperature sensing with a two-sensor design; compass; always-on altimeter; high-g accelerometer (up to 256 g-forces); high dynamic range gyroscope; ambient light sensor; water temperature sensor; depth gauge
Health features
Health features	Heart Rate app; high and low heart rate notifications; irregular rhythm notifications; sleep apnoea notifications; sleep stages and sleep score; Vitals app (heart rate, respiratory rate, wrist temperature and sleep duration); Cycle Tracking with fertile window and retrospective ovulation estimates, perimenopause and menopause support; Medications; Mindfulness; Noise	ECG app; Blood Oxygen app; irregular rhythm notifications; temperature sensing for retrospective ovulation estimates in Cycle Tracking
Fitness features
Fitness features	Custom workouts; Training Load; customisable heart rate zones; VO2 max; Race Route; Pacer; cadence, stride length, ground contact time, vertical oscillation and running power; automatic track detection; multisport workouts; offline maps with custom route creation; Backtrack; pool and open-water swimming with SWOLF; cycling power zones with Bluetooth accessories; GymKit	Depth app and recreational diving to 40 m with the Oceanic+ app; Backtrack; Compass Waypoints; Action button for workouts, segments and waypoints; GymKit
Safety features
Safety features	Emergency SOS; international emergency calling; Fall Detection; Crash Detection; Check In; Backtrack; noise monitoring	Emergency SOS; international emergency calling; Fall Detection; Crash Detection; 86 dB emergency siren
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 32 hours	–
Mobile data option
Mobile data option	Yes	Yes
Works with
Works with	iPhone	iPhone
Chip
Chip	S10	S8
Storage
Storage	64 GB (better)	32 GB
Battery life detail
Battery life detail	Up to 18 hours of normal use; up to 32 hours in Low Power Mode; up to 7 hours of outdoor workout	Up to 36 hours of normal use; up to 18 hours on LTE
Charging
Charging	Fast charging to 80% in about 45 minutes; 15 minutes for up to 8 hours of normal use; 8 minutes for up to 8 hours of sleep tracking	Apple Watch Magnetic Fast Charger to USB-C Cable
Connectivity
Connectivity	Wi-Fi 4 (802.11n) at 2.4GHz; Bluetooth 5.3; NFC for Apple Pay; L1 GPS (GLONASS, Galileo, QZSS and BeiDou); GPS + Cellular models (A3326, A3328) with 5G RedCap and LTE	4G LTE and UMTS; Wi-Fi 802.11b/g/n at 2.4 GHz and 5 GHz; Bluetooth 5.3; W3 wireless chip; U1 chip (Ultra Wideband); L1 and L5 GPS with GLONASS, Galileo, QZSS and BeiDou; Apple Pay
Storage
Storage	–	32GB
Design
Weight (lightest version)
Weight (lightest version)	26.3 g (better)	61.3 g
Software
Software	watchOS	watchOS
Case materials
Case materials	100% recycled aluminium case with nylon composite and sapphire crystal back; water resistant to 50 m (ISO 22810:2010)	Aerospace-grade natural titanium case; ceramic and sapphire crystal back; water resistant to 100 m (ISO 22810); IP6X dust resistant; tested to MIL-STD 810H; on-wrist operating temperature from -20°C to 55°C
Size
Size	40mm is 40 x 34 x 10.7 mm, 26.3 g (GPS) or 26.4 g (GPS + Cellular); 44mm is 44 x 38 x 10.7 mm, 32.9 g (GPS) or 33.0 g (GPS + Cellular)	49 x 44 x 12 mm; 61.3 g
Bands
Bands	Fits 130–200 mm wrists (40mm) or 140–245 mm wrists (44mm)	Alpine Loop, Trail Loop and Ocean Band
Colours
Colours	Midnight or Starlight aluminium	Natural titanium
In the box
In the box	Apple Watch SE 3, strap, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)	Apple Watch Ultra, band or loop, Apple Watch Magnetic Fast Charger to USB-C Cable (1 m)