Screen size
Watch Series 122.0"
Watch Ultra 4Winner: 2.0"+1%
Quick verdict
Watch Ultra 4 leads the measured specs 4-2.
Measured wins
Watch Series 12
2
spec wins
Ties
7
equal specs
Watch Ultra 4
4
spec wins
Overall winner
Screen size
Technology
Watch Series 12
GSM / HSPA / LTE / 5G
Watch Ultra 4
GSM / HSPA / LTE / 5G
2G bands
Watch Series 12
GSM 850 / 900 / 1800 / 1900
Watch Ultra 4
GSM 850 / 900 / 1800 / 1900
3G bands
Watch Series 12
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
Watch Ultra 4
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
4G bands
Watch Series 12
1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 38, 39, 40, 41, 66, 71
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
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
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
HSPA, LTE, 5G
Watch Ultra 4
HSPA, LTE, 5G
Announced
Watch Series 12
2026, September 09
Watch Ultra 4
2026, September 09
Status
Watch Series 12
Available. Released 2026, September 18
Watch Ultra 4
Available. Released 2026, September 18
Dimensions
Watch Series 12
46 x 40 x 9.7 mm - titanium47 x 41 x 9.9 mm - ceramic
Watch Ultra 4
49 x 44 x 12 mm (1.93 x 1.73 x 0.47 in)
Weight
Watch Series 12
36.5/41.7/42.8/44.9/51.3/52.9 g (1.31 oz)
Watch Ultra 4
63 g (2.22 oz)
Build
Watch Series 12
Sapphire crystal front, zirconia back, titanium case (grade 5) or ceramic case
Watch Ultra 4
Sapphire crystal front, ceramic and zirconia back, titanium frame (grade 5)
SIM
Watch Series 12
eSIM
Watch Ultra 4
eSIM
Other
Watch Series 12
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
Retina LTPO3 OLED, 2000 nits (peak)
Watch Ultra 4
Retina LTPO3 OLED, 3000 nits (peak)
Size
Watch Series 12
1.96 inches
Watch Ultra 4
1.98 inches
Resolution
Watch Series 12
496 x 416 pixels (~326 ppi density)
Watch Ultra 4
514 x 422 pixels (~326 ppi density)
Protection
Watch Series 12
Sapphire crystal
Watch Ultra 4
Sapphire crystal
Other
Watch Series 12
Wide-angle OLED
Watch Ultra 4
Wide-angle OLED
OS
Watch Series 12
watchOS 27
Watch Ultra 4
watchOS 27
Chipset
Watch Series 12
Apple S11
Watch Ultra 4
Apple S11
CPU
Watch Series 12
Dual-core
Watch Ultra 4
Dual-core
GPU
Watch Series 12
PowerVR
Watch Ultra 4
PowerVR
Card slot
Watch Series 12
No
Watch Ultra 4
No
Internal
Watch Series 12
64GB
Watch Ultra 4
64GB
Other
Watch Series 12
No
Watch Ultra 4
No
Loudspeaker
Watch Series 12
Yes
Watch Ultra 4
Yes, with dual speakers (86-decibel)
3.5mm jack
Watch Series 12
No
Watch Ultra 4
No
WLAN
Watch Series 12
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
5.3, A2DP, LE
Watch Ultra 4
5.3, A2DP, LE
Positioning
Watch Series 12
GPS, GLONASS, GALILEO, QZSS, BDS
Watch Ultra 4
GPS (L1+L5), GLONASS, GALILEO, BDS, QZSS
NFC
Watch Series 12
Yes
Watch Ultra 4
Yes
Radio
Watch Series 12
No
Watch Ultra 4
No
USB
Watch Series 12
No
Watch Ultra 4
No
Sensors
Watch Series 12
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
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
Li-Ion
Watch Ultra 4
Charging
Watch Series 12
Wireless, 0-80% in 30 min
Watch Ultra 4
Wireless, 0-80% in 45 min
Colors
Watch Series 12
Radiant Gold Titanium, Natural Titanium, Silver Titanium (Hermès only), Pearl White Ceramic, Night Blue Ceramic
Watch Ultra 4
Natural, Black
Models
Watch Series 12
A3582, A3587
Watch Ultra 4
A3579
Price
Watch Series 12
€ 439.00
Watch Ultra 4
€ 876.00