Screen size
Watch Series 12 Aluminum2.0"
Watch Ultra 4Winner: 2.0"+1%
Quick verdict
Watch Ultra 4 leads the measured specs 4-2.
Measured wins
Watch Series 12 Aluminum
2
spec wins
Ties
7
equal specs
Watch Ultra 4
4
spec wins
Overall winner
Screen size
Technology
Watch Series 12 Aluminum
GSM / HSPA / LTE / 5G
Watch Ultra 4
GSM / HSPA / LTE / 5G
2G bands
Watch Series 12 Aluminum
GSM 850 / 900 / 1800 / 1900
Watch Ultra 4
GSM 850 / 900 / 1800 / 1900
3G bands
Watch Series 12 Aluminum
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
Watch Ultra 4
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands
Watch Series 12 Aluminum
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
equal specsMain camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
equal specsBluetooth
equal specsUSB
5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 38, 39, 40, 41, 66, 71
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 Series 12 Aluminum
1, 2, 3, 5, 7, 8, 12, 14, 20, 25, 26, 28, 38, 40, 41, 66, 71 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 Series 12 Aluminum
HSPA, LTE, 5G
Watch Ultra 4
HSPA, LTE, 5G
Announced
Watch Series 12 Aluminum
2026, September 09
Watch Ultra 4
2026, September 09
Status
Watch Series 12 Aluminum
Available. Released 2026, September 18
Watch Ultra 4
Available. Released 2026, September 18
Dimensions
Watch Series 12 Aluminum
46 x 40 x 9.7 mm (1.81 x 1.57 x 0.38 in)
Watch Ultra 4
49 x 44 x 12 mm (1.93 x 1.73 x 0.47 in)
Weight
Watch Series 12 Aluminum
31.5/32.2/38.6/39.5 g (1.13 oz)
Watch Ultra 4
63 g (2.22 oz)
Build
Watch Series 12 Aluminum
Glass front (Ceramic Shield 2), zirconia back, aluminum case
Watch Ultra 4
Sapphire crystal front, ceramic and zirconia back, titanium frame (grade 5)
SIM
Watch Series 12 Aluminum
eSIM
Watch Ultra 4
eSIM
Other
Watch Series 12 Aluminum
IP6X certified 50m water resistant ECG certified (region dependent SW application; HW available on all models) Depth gauge to 6m
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 Series 12 Aluminum
Retina LTPO3 OLED, 2000 nits (peak)
Watch Ultra 4
Retina LTPO3 OLED, 3000 nits (peak)
Size
Watch Series 12 Aluminum
1.96 inches
Watch Ultra 4
1.98 inches
Resolution
Watch Series 12 Aluminum
496 x 416 pixels (~326 ppi density)
Watch Ultra 4
514 x 422 pixels (~326 ppi density)
Protection
Watch Series 12 Aluminum
Ceramic Shield 2
Watch Ultra 4
Sapphire crystal
Other
Watch Series 12 Aluminum
Wide-angle OLED
Watch Ultra 4
Wide-angle OLED
OS
Watch Series 12 Aluminum
watchOS 27
Watch Ultra 4
watchOS 27
Chipset
Watch Series 12 Aluminum
Apple S11
Watch Ultra 4
Apple S11
CPU
Watch Series 12 Aluminum
Dual-core
Watch Ultra 4
Dual-core
GPU
Watch Series 12 Aluminum
PowerVR
Watch Ultra 4
PowerVR
Card slot
Watch Series 12 Aluminum
No
Watch Ultra 4
No
Internal
Watch Series 12 Aluminum
64GB
Watch Ultra 4
64GB
Other
Watch Series 12 Aluminum
No
Watch Ultra 4
No
Loudspeaker
Watch Series 12 Aluminum
Yes
Watch Ultra 4
Yes, with dual speakers (86-decibel)
3.5mm jack
Watch Series 12 Aluminum
No
Watch Ultra 4
No
WLAN
Watch Series 12 Aluminum
Wi-Fi 802.11 b/g/n, dual-band
Watch Ultra 4
Wi-Fi 802.11 b/g/n, dual-band
Bluetooth
Watch Series 12 Aluminum
5.3, A2DP, LE
Watch Ultra 4
5.3, A2DP, LE
Positioning
Watch Series 12 Aluminum
GPS, GLONASS, GALILEO, QZSS, BDS
Watch Ultra 4
GPS (L1+L5), GLONASS, GALILEO, BDS, QZSS
NFC
Watch Series 12 Aluminum
Yes
Watch Ultra 4
Yes
Radio
Watch Series 12 Aluminum
No
Watch Ultra 4
No
USB
Watch Series 12 Aluminum
No
Watch Ultra 4
No
Sensors
Watch Series 12 Aluminum
Accelerometer, gyro, always-on heart rate, barometer, always-on altimeter, 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 Series 12 Aluminum
Health Sensing System: third‑generation electrical heart sensor, always‑on optical heart sensor, blood oxygen sensor, temperature sensor Temperature sensing (0.01˚ accuracy) Ultra Wideband (UWB) support (gen2 chip) Media playback
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 Series 12 Aluminum
Li-Ion
Watch Ultra 4
Charging
Watch Series 12 Aluminum
Wireless, 0-80% in 30 min
Watch Ultra 4
Wireless, 0-80% in 45 min
Colors
Watch Series 12 Aluminum
Dark Bronze, Light Gold, Black, Space Gray
Watch Ultra 4
Natural, Black
Models
Watch Series 12 Aluminum
A3582, A3587
Watch Ultra 4
A3579
Price
Watch Series 12 Aluminum
€ 439.00
Watch Ultra 4
€ 876.00