Apple Watch Ultra 4 vs Garmin fēnix 9 Pro AMOLED

Apple Watch Ultra 4 is the better all-round smartwatch, with deeper iPhone integration, stronger everyday smart features and Apple’s latest health sensing. Garmin Fenix 9 Pro remains the better choice for serious endurance training and outdoor use, particularly if battery life, detailed training metrics, navigation and Garmin’s broader sports ecosystem matter more than smartwatch functionality.

At a glance

What's different?

The strongest database-backed differences, without pretending every different number is an advantage.

Apple Watch Ultra 4

  • Phone compatibility iPhone 11 or later or iPhone SE (2nd generation or later) with iOS 27 or later
  • Satellite SOS Not available on the other model
  • Hypertension notifications Hypertension notifications (no direct blood-pressure measurement)
  • Cellular connectivity Not available on the other model
  • 36% lighter 63.0 g vs 99 g

Garmin fēnix 9 Pro 51 mm AMOLED

  • Phone compatibility Android and iOS
  • Much longer battery life 31 days vs 50 hours
  • More advanced training tools Body Battery, Training Status, Training Load Focus +12 more
  • LED flashlight Not available on the other model
  • Stress tracking Not available on the other model
Both include ECG, blood oxygen tracking, skin temperature tracking, HRV tracking, on-board music, Bluetooth calling, a microphone.
Full comparison

The full record

77 specifications across 6 areas, with 31 genuine differences.

1. Design & display 10 differences · advantages split between the two Mixed
Fact
Apple Watch Ultra 4
Garmin fēnix 9 Pro 51 mm AMOLED
Release date
2026-09-18
August 2026
Physical size
49 x 44 x 12 mm
51 x 51 x 15.8 mm
Weight
63.0 g (Natural), 63.1 g (Black)
99 g (case only: 73 g)
Material
Grade 5 titanium case
Titanium case and bezel; sapphire crystal; silicone strap
Water resistance
10 ATM; IP6X; MIL-STD 810H; recreational scuba diving to 40 m
10 ATM
Color options
Natural Titanium, Black Titanium
Carbon Gray DLC Titanium Black/Pebble
Display type
Always-On Retina LTPO3 wide-angle OLED
AMOLED touchscreen
Display size
49 mm case
1.5 inch diameter
Display resolution
422 x 514 pixels
466 x 466 pixels
Display brightness
Up to 3,000 nits
Up to 3,000 nits
Display protection
Flat sapphire crystal display
Sapphire crystal
2. Battery & charging 2 differences · Garmin fēnix 9 Pro 51 mm AMOLED leads on Battery life Garmin fēnix 9 Pro 51 mm AMOLED
Fact
Apple Watch Ultra 4
Garmin fēnix 9 Pro 51 mm AMOLED
Battery
Rechargeable lithium-ion battery
Rechargeable lithium-ion battery
Battery life
Up to 50 hours normal use; up to 84 hours in Low Power Mode; up to 18 hours outdoor workout; up to 25 hours Extended Workout; up to 45 hours Max Extended Workout
Smartwatch: up to 31 days; Low Power Watch Mode: up to 42 days; Activity Mode (Normal): up to 56 hours; Activity Mode + Music (Normal): up to 22 hours; Activity Mode (Max Battery): up to 151 hours; Activity Mode (Extended Battery): up to 65 hours; Activity Mode (Max Accuracy): up to 45 hours; Expedition Mode: up to 31 days
Charging
USB-C magnetic fast charging; up to 80% in about 45 minutes
Garmin proprietary charging cable
3. Sensors & positioning 2 differences · no clear overall edge No clear edge
Fact
Apple Watch Ultra 4
Garmin fēnix 9 Pro 51 mm AMOLED
GNSS type
Built-in dual-band GNSS
Multi-band GNSS with SatIQ
GPS
Yes
Yes
GALILEO
Yes
Yes
GLONASS
No
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 3 differences · advantages split between the two Mixed
Fact
Apple Watch Ultra 4
Garmin fēnix 9 Pro 51 mm AMOLED
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 Ultra 3)
Yes
Stress
No
Yes
Blood oxygen
Yes
Yes
Respiration rate
Yes
Yes
Skin temperature
Yes
Yes
ECG
Yes
Yes
Blood pressure
Hypertension notifications (no direct blood-pressure measurement)
No
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
No
5. Smart features 10 differences · Apple Watch Ultra 4 leads on UWB, Cellular Apple Watch Ultra 4
Fact
Apple Watch Ultra 4
Garmin fēnix 9 Pro 51 mm AMOLED
Smartphone compatibility
iPhone 11 or later or iPhone SE (2nd generation or later) with iOS 27 or later
Android and iOS
Operating system at launch
watchOS 27
Garmin proprietary
Processor
Apple S11, 64-bit dual-core processor; 4-core Neural Engine; Audio Intelligence
NXP i.MX RT700
Storage
64 GB
64 GB
Bluetooth
Yes (5.3)
Yes
Wi-Fi
Yes (Wi-Fi 4 / 802.11n, 2.4/5 GHz)
Yes
NFC / connected pay
Yes (Apple Pay)
Yes
UWB
Yes (2nd-generation UWB)
No
Cellular
Yes (5G RedCap and LTE on supported regional models)
No
Smartphone notifications
Yes
Yes
Bluetooth calling
Yes (standalone on cellular models; via paired iPhone otherwise)
Yes (paired smartphone)
Smartphone music control
Yes
Yes
On-board music storage
Yes
Yes
Voice assistant
Siri AI powered by Apple Intelligence
Yes (paired smartphone)
6. Navigation & safety 4 differences · advantages split between the two Mixed
Fact
Apple Watch Ultra 4
Garmin fēnix 9 Pro 51 mm AMOLED
Maps
Yes
Yes
Offline maps
Yes
Yes
Navigation
Yes
Yes
Emergency SOS
Yes
Yes (paired smartphone)
Satellite SOS
Yes
No
Fall detection
Yes
Yes
LED flashlight
No
Yes (built-in LED flashlight; green light mode)
Diving
Yes
Yes (scuba and apnea to 40 m)

Individual specifications

These technical specs are correct to the best of our knowledge at the time of publishing.