Apple Watch Series 12 vs Watch Ultra 3 specs comparison
Go for the Series 12 if you want the newer everyday Apple Watch experience in a lighter, more compact package. The Ultra 3 is still the better choice for longer battery life, tougher construction and more serious outdoor use.
Full comparison
The full record
79 specifications across 6 areas, with 22 genuine differences.
1. Design & display Mixed
Fact
Apple Watch Series 12
Apple Watch Ultra 3
Release date
2026-09-18
2025-09-19
Physical size
Aluminum/titanium: 46 x 40 x 9.7 mm or 42 x 37 x 9.7 mm; ceramic: 47 x 41 x 9.85 mm or 43 x 37 x 9.85 mm
49 x 44 x 12 mm
Weight
46 mm: 39.5 g (aluminum GPS), 38.6 g (aluminum GPS + Cellular), 44.9 g (titanium), 51.3 g (Pearl White ceramic), 52.9 g (Night Blue ceramic); 42 mm: 32.2 g, 31.5 g, 36.5 g, 41.7 g and 42.8 g respectively
61.6 g (Natural), 61.8 g (Black)
Material
Aluminum, titanium or ceramic case, 60% tougher than Series 11
Grade 5 titanium case
Water resistance
5 ATM; IP6X; depth gauge to 6 m
10 ATM; IP6X; MIL-STD 810H; recreational scuba diving to 40 m
Color options
Aluminum: Dark Bronze, Light Gold, Black, Space Gray; Titanium: Radiant Gold, Natural; Ceramic: Pearl White, Night Blue
Natural Titanium, Black Titanium
Display type
Always-On Retina LTPO3 wide-angle OLED
Always-On Retina LTPO3 wide-angle OLED
Display size
42 mm or 46 mm case (ceramic cases are 43 mm or 47 mm tall)
49 mm case
Display resolution
42 mm: 374 x 446 pixels; 46 mm: 416 x 496 pixels
422 x 514 pixels
Display brightness
Up to 2,000 nits
Up to 3,000 nits
Display protection
Ceramic Shield 2 on aluminum cases; sapphire front crystal on titanium and ceramic cases
Flat sapphire crystal display
2. Battery & charging Apple Watch Ultra 3
Fact
Apple Watch Series 12
Apple Watch Ultra 3
Battery
Rechargeable lithium-ion battery
Rechargeable lithium-ion battery
Battery life
Up to 24 hours; up to 38 hours in Low Power Mode
Up to 42 hours; up to 72 hours in Low Power Mode
Charging
USB-C magnetic fast charging
USB-C magnetic fast charging; up to 80% in about 45 minutes
3. Sensors & positioning Apple Watch Ultra 3
Fact
Apple Watch Series 12
Apple Watch Ultra 3
GNSS type
Built-in GNSS
Built-in dual-band GNSS
GPS
Yes
Yes
GALILEO
Yes
Yes
GLONASS
Yes
Yes
QZSS
Yes
Yes
Beidou
Yes
Yes
Accelerometer
Yes
Yes
Gyroscope
Yes
Yes
Barometric altimeter
Yes
Yes
Compass
Yes
Yes
Ambient light sensor
Yes
Yes
Optical heart rate
Yes (always-on optical heart sensor; high-frequency background tracking)
Yes
Electrical heart rate
Yes
Yes
SpO2
Yes
Yes
Temperature
Yes
Yes
Galvanic skin response
No
No
Microphone
Yes
Yes
Speakers
Yes
Yes
Vibration motor
Yes
Yes
4. Health & activity No clear edge
Fact
Apple Watch Series 12
Apple Watch Ultra 3
Steps
Yes
Yes
Distance
Yes
Yes
Calories burned
Yes
Yes
Floors
Yes
Yes
Sports tracking
Yes
Yes
Sleep
Yes
Yes
Heart rate
Yes
Yes
HRV
Yes (Up to 24x more frequent than Series 11)
Yes
Stress
No
No
Blood oxygen
Yes
Yes
Respiration rate
Yes
Yes
Skin temperature
Yes
Yes
ECG
Yes
Yes
Blood pressure
Hypertension notifications (no direct blood-pressure measurement)
Hypertension notifications (no direct blood-pressure measurement)
Body composition
No
No
Glucose
No
No
Hydration level
No
No
UV exposure
No
No
Calorie intake
No
No
Hyperglycemia risk assessment
No
No
Arterial stiffness detection
No
No
Pulse wave arrhythmia analysis
Yes
Yes
Readiness
Yes
No
5. Smart features No clear edge
Fact
Apple Watch Series 12
Apple Watch Ultra 3
Smartphone compatibility
iPhone 11 or later or iPhone SE (2nd generation or later) with iOS 27 or later
iPhone 11 or later with iOS 26 or later
Operating system at launch
watchOS 27
watchOS 26
Processor
Apple S11, 64-bit dual-core processor; 4-core Neural Engine; Audio Intelligence
Apple S10, 64-bit dual-core; 4-core Neural Engine
RAM
4 GB
2 GB
Storage
64 GB
64 GB
Bluetooth
Yes (5.3)
Yes (5.3)
Wi-Fi
Yes (Wi-Fi 4 / 802.11n, 2.4/5 GHz)
Yes (Wi-Fi 4 / 802.11n, 2.4/5 GHz)
NFC / connected pay
Yes (Apple Pay)
Yes (Apple Pay)
UWB
Yes (2nd-generation UWB)
Yes (2nd-generation UWB)
Cellular
Optional (5G RedCap and LTE on supported regional models)
Yes (5G RedCap and LTE on supported regional models)
Smartphone notifications
Yes
Yes
Bluetooth calling
Yes (standalone on cellular models; via paired iPhone otherwise)
Yes (standalone on cellular models; via paired iPhone otherwise)
Smartphone music control
Yes
Yes
On-board music storage
Yes
Yes
Voice assistant
Siri AI powered by Apple Intelligence
Siri
6. Navigation & safety Apple Watch Ultra 3
Fact
Apple Watch Series 12
Apple Watch Ultra 3
Maps
Yes
Yes
Offline maps
Yes
Yes
Navigation
Yes
Yes
Emergency SOS
Yes
Yes
Satellite SOS
No
Yes
Fall detection
Yes
Yes
LED flashlight
No
No
Diving
No
Yes