Screen size
equal specsWatch Ultra 32.0"
Watch Ultra 42.0"
Quick verdict
Watch Ultra 3 leads the measured specs 3-2.
Measured wins
Watch Ultra 3
3
spec wins
Overall winner
Ties
9
equal specs
Watch Ultra 4
2
spec wins
Screen size
equal specsTechnology
Watch Ultra 3
GSM / HSPA / LTE / 5G
Watch Ultra 4
GSM / HSPA / LTE / 5G
2G bands
Watch Ultra 3
GSM 850 / 900 / 1800 / 1900
Watch Ultra 4
GSM 850 / 900 / 1800 / 1900
3G bands
Watch Ultra 3
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - International, China, HK, HSDPA 850 / 1700(AWS) / 1900 / 2100 - USA, LATAM, Canada
Watch Ultra 4
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands
Watch Ultra 3
Resolution
equal specsRefresh rate
Peak brightness
equal specsPixel density
CPU speed
RAM
Storage
equal specsMain camera
Front camera
Battery
Wired charging
Weight
Thickness
equal specsIP rating
Wi‑Fi
Bluetooth
USB
5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
1, 2, 3, 4, 5, 6, 7, 8, 18, 19, 20, 25, 26, 28, 39, 40, 41, 66 - International, China, HK, 1, 2, 3, 4, 5, 6, 7, 12, 13, 14, 17, 18, 19, 25, 26, 39, 40, 41, 66 - USA, LATAM, Canada
Watch Ultra 4
1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 38, 39, 40, 41, 53, 66, 71
5G bands
Watch Ultra 3
SA/NSA
Watch Ultra 4
1, 2, 3, 5, 7, 8, 12, 14, 20, 25, 26, 28, 38, 40, 41, 53, 66, 71 SA/NSA
Speed
Watch Ultra 3
HSPA, LTE, 5G
Watch Ultra 4
HSPA, LTE, 5G
Announced
Watch Ultra 3
2025, September 09
Watch Ultra 4
2026, September 09
Status
Watch Ultra 3
Available. Released 2025, September 19
Watch Ultra 4
Available. Released 2026, September 18
Dimensions
Watch Ultra 3
49 x 44 x 12 mm (1.93 x 1.73 x 0.47 in)
Watch Ultra 4
49 x 44 x 12 mm (1.93 x 1.73 x 0.47 in)
Weight
Watch Ultra 3
61.6 g or 61.8 g (black) (2.15 oz)
Watch Ultra 4
63 g (2.22 oz)
Build
Watch Ultra 3
Sapphire crystal front, ceramic/sapphire crystal back, titanium frame (grade 5)
Watch Ultra 4
Sapphire crystal front, ceramic and zirconia back, titanium frame (grade 5)
SIM
Watch Ultra 3
eSIM
Watch Ultra 4
eSIM
Other
Watch Ultra 3
IP6X certified 100m water resistant (22810:2010) 40m swimproof/diving (EN13319) MIL-STD-810H compliant ECG certified (region dependent SW application; HW available on all models)
Watch Ultra 4
IP6X certified 100m water resistant (22810:2010) 40m swimproof/diving (EN13319) MIL-STD-810H compliant ECG certified (region dependent SW application; HW available on all models)
Type
Watch Ultra 3
Retina LTPO3 OLED, 3000 nits (peak)
Watch Ultra 4
Retina LTPO3 OLED, 3000 nits (peak)
Size
Watch Ultra 3
1.98 inches
Watch Ultra 4
1.98 inches
Resolution
Watch Ultra 3
514 x 422 pixels (~326 ppi density)
Watch Ultra 4
514 x 422 pixels (~326 ppi density)
Protection
Watch Ultra 3
Sapphire crystal glass
Watch Ultra 4
Sapphire crystal
Other
Watch Ultra 3
Wide-angle OLED
Watch Ultra 4
Wide-angle OLED
OS
Watch Ultra 3
watchOS 26, upgradable to watchOS 26.2.1
Watch Ultra 4
watchOS 27
Chipset
Watch Ultra 3
Apple S10
Watch Ultra 4
Apple S11
CPU
Watch Ultra 3
Dual-core
Watch Ultra 4
Dual-core
GPU
Watch Ultra 3
PowerVR
Watch Ultra 4
PowerVR
Card slot
Watch Ultra 3
No
Watch Ultra 4
No
Internal
Watch Ultra 3
64GB
Watch Ultra 4
64GB
Other
Watch Ultra 3
No
Watch Ultra 4
No
Loudspeaker
Watch Ultra 3
Yes, with dual speakers (86-decibel)
Watch Ultra 4
Yes, with dual speakers (86-decibel)
3.5mm jack
Watch Ultra 3
No
Watch Ultra 4
No
WLAN
Watch Ultra 3
Wi-Fi 802.11 b/g/n, dual-band
Watch Ultra 4
Wi-Fi 802.11 b/g/n, dual-band
Bluetooth
Watch Ultra 3
5.3, A2DP, LE
Watch Ultra 4
5.3, A2DP, LE
Positioning
Watch Ultra 3
GPS (L1+L5), GLONASS, GALILEO, BDS, QZSS
Watch Ultra 4
GPS (L1+L5), GLONASS, GALILEO, BDS, QZSS
NFC
Watch Ultra 3
Yes
Watch Ultra 4
Yes
Radio
Watch Ultra 3
No
Watch Ultra 4
No
USB
Watch Ultra 3
No
Watch Ultra 4
No
Sensors
Watch Ultra 3
Accelerometer, gyro, heart rate, barometer, always-on altimeter (-500m to 9000m), compass, SpO2, VO2max, temperature (body), temperature (water)
Watch Ultra 4
Accelerometer, gyro, always-on heart rate, barometer, always-on altimeter (-500m to 9000m), compass, SpO2, VO2max, temperature (body), temperature (water)
Other
Watch Ultra 3
Temperature sensing (0.01˚ accuracy) Depth gauge (±1m accuracy) Ultra Wideband (UWB) support (gen2 chip) Emergency SOS via satellite
Watch Ultra 4
Health Sensing System: third‑generation electrical heart sensor, always‑on optical heart sensor, blood oxygen sensor, temperature sensor Temperature sensing (0.01˚ accuracy) Depth gauge (±1m accuracy) Ultra Wideband (UWB) support (gen2 chip) Emergency SOS via satellite
Type
Watch Ultra 3
Li-Ion 599 mAh
Watch Ultra 4
Charging
Watch Ultra 3
Wireless, 0-80% in 45 min
Watch Ultra 4
Wireless, 0-80% in 45 min
Colors
Watch Ultra 3
Natural, Black
Watch Ultra 4
Natural, Black
Models
Watch Ultra 3
A3281, A3282
Watch Ultra 4
A3579
SAR
Watch Ultra 3
1.16 W/kg (head)
Watch Ultra 4
-
SAR EU
Watch Ultra 3
1.19 W/kg (head)
Watch Ultra 4
-
Price
Watch Ultra 3
€ 829.00
Watch Ultra 4
€ 876.00