Screen size
Watch Series 81.9"
Watch Ultra 3Winner: 2.0"+4%
Quick verdict
Watch Ultra 3 leads the measured specs 6-3.
Measured wins
Watch Series 8
3
spec wins
Ties
5
equal specs
Watch Ultra 3
6
spec wins
Overall winner
Screen size
Technology
Watch Series 8
GSM / HSPA / LTE
Watch Ultra 3
GSM / HSPA / LTE / 5G
2G bands
Watch Series 8
GSM 850 / 900 / 1800 / 1900
Watch Ultra 3
GSM 850 / 900 / 1800 / 1900
3G bands
Watch Series 8
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - International, China, HK, HSDPA 850 / 1700(AWS) / 1900 / 2100 - USA, LATAM, Canada
Watch Ultra 3
HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 - International, China, HK, HSDPA 850 / 1700(AWS) / 1900 / 2100 - USA, LATAM, Canada
4G bands
Resolution
Refresh rate
Peak brightness
Pixel density
equal specsCPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
equal specsUSB
5G support
NFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
Watch Series 8
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 3
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
Speed
Watch Series 8
HSPA, LTE
Watch Ultra 3
HSPA, LTE, 5G
5G bands
Watch Series 8
-
Watch Ultra 3
SA/NSA
Announced
Watch Series 8
2022, September 07
Watch Ultra 3
2025, September 09
Status
Watch Series 8
Available. Released 2022, September 16
Watch Ultra 3
Available. Released 2025, September 19
Dimensions
Watch Series 8
45 x 38 x 10.7 mm (1.77 x 1.50 x 0.42 in)
Watch Ultra 3
49 x 44 x 12 mm (1.93 x 1.73 x 0.47 in)
Weight
Watch Series 8
42.3 g (41mm), 51.5 g (45mm) (1.48 oz)
Watch Ultra 3
61.6 g or 61.8 g (black) (2.15 oz)
Build
Watch Series 8
Sapphire crystal front, ceramic/sapphire crystal back, stainless steel frame
Watch Ultra 3
Sapphire crystal front, ceramic/sapphire crystal back, titanium frame (grade 5)
SIM
Watch Series 8
eSIM
Watch Ultra 3
eSIM
Other
Watch Series 8
IP6X certified 50m water resistant ECG certified (region dependent SW application; HW available on all models)
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)
Type
Watch Series 8
Retina LTPO OLED, 1000 nits (peak)
Watch Ultra 3
Retina LTPO3 OLED, 3000 nits (peak)
Size
Watch Series 8
1.9 inches
Watch Ultra 3
1.98 inches
Resolution
Watch Series 8
484 x 396 pixels (~326 ppi density)
Watch Ultra 3
514 x 422 pixels (~326 ppi density)
Protection
Watch Series 8
Sapphire crystal glass
Watch Ultra 3
Sapphire crystal glass
Other
Watch Series 8
-
Watch Ultra 3
Wide-angle OLED
OS
Watch Series 8
watchOS 9.0, upgradable to watchOS 26.2.1
Watch Ultra 3
watchOS 26, upgradable to watchOS 26.2.1
Chipset
Watch Series 8
Apple S8
Watch Ultra 3
Apple S10
CPU
Watch Series 8
Dual-core
Watch Ultra 3
Dual-core
GPU
Watch Series 8
PowerVR
Watch Ultra 3
PowerVR
Card slot
Watch Series 8
No
Watch Ultra 3
No
Internal
Watch Series 8
32GB 1GB RAM
Watch Ultra 3
64GB
Other
Watch Series 8
eMMC 5.1
Watch Ultra 3
-
Other
Watch Series 8
No
Watch Ultra 3
No
Loudspeaker
Watch Series 8
Yes
Watch Ultra 3
Yes, with dual speakers (86-decibel)
3.5mm jack
Watch Series 8
No
Watch Ultra 3
No
WLAN
Watch Series 8
Wi-Fi 802.11 b/g/n, dual-band
Watch Ultra 3
Wi-Fi 802.11 b/g/n, dual-band
Bluetooth
Watch Series 8
5.3, A2DP, LE
Watch Ultra 3
5.3, A2DP, LE
Positioning
Watch Series 8
GPS, GLONASS, GALILEO, QZSS, BDS
Watch Ultra 3
GPS (L1+L5), GLONASS, GALILEO, BDS, QZSS
NFC
Watch Series 8
Yes
Watch Ultra 3
Yes
Radio
Watch Series 8
No
Watch Ultra 3
No
USB
Watch Series 8
No
Watch Ultra 3
No
Sensors
Watch Series 8
Accelerometer, gyro, heart rate, barometer, always-on altimeter, compass, SpO2, VO2max, temperature (body)
Watch Ultra 3
Accelerometer, gyro, heart rate, barometer, always-on altimeter (-500m to 9000m), compass, SpO2, VO2max, temperature (body), temperature (water)
Other
Watch Series 8
Temperature sensing (0.01˚ accuracy) Ultra Wideband (UWB) support
Watch Ultra 3
Temperature sensing (0.01˚ accuracy) Depth gauge (±1m accuracy) Ultra Wideband (UWB) support (gen2 chip) Emergency SOS via satellite
Type
Watch Series 8
Li-Ion 308 mAh
Watch Ultra 3
Li-Ion 599 mAh
Charging
Watch Series 8
Wireless, 0-80% in 45 min
Watch Ultra 3
Wireless, 0-80% in 45 min
Colors
Watch Series 8
Graphite, Silver, Gold
Watch Ultra 3
Natural, Black
Models
Watch Series 8
A2773, A2775, A2772, A2774, A2857, A2858, watch6,16, watch6,17
Watch Ultra 3
A3281, A3282
SAR
Watch Series 8
0.31 W/kg (head) 0.55 W/kg (body)
Watch Ultra 3
1.16 W/kg (head)
SAR EU
Watch Series 8
0.31 W/kg (head) 0.55 W/kg (body)
Watch Ultra 3
1.19 W/kg (head)
Price
Watch Series 8
About 330 EUR
Watch Ultra 3
€ 829.00