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2026 comparison
Updated Jan 7, 2026
|Sources: Amazon, ManufacturerAmazfit T-Rex 3 vs Apple Watch Ultra 3
If you're deciding between the Amazfit T-Rex 3 and the Apple Watch Ultra 3, the winner is clear: the Apple Watch Ultra 3. Its stunning 3,000-nit display brightness crushes the Amazfit T-Rex 3's 2,000 nits, making it much easier to read in bright sunlight. The Amazfit T-Rex 3 offers incredible battery life—27 days compared to just 72 hours on low power mode for the Ultra 3. If long-lasting battery is your priority, the T-Rex 3 shines, especially for outdoor adventures where charging options may be limited. But if you want top-notch display quality and advanced features, the Ultra 3 is a no-brainer for 2026 and beyond.
⚖️ Weight: 2.41 oz vs 2.18 oz💽 Storage: 32 GB vs 64 GB🔋 Battery: 27 days vs 72 hours
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Amazfit T-Rex 3
★4.5
(1,926)•Amazon
Compatibility:Android 7.0 or later; iOS 14.0 or later (Zepp App required)
Operating System:Zepp OS 4
Case Size:48.5mm x 48.5mm x 13.75mm
Case Material:Polymer middle frame; Stainless steel bezel (316L)
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Apple Watch Ultra 3
★4.7
(425)•Amazon
Compatibility:iPhone Xs or later (incl. iPhone SE 2nd gen+) with iOS 18 or later
Operating System:watchOS
Case Size:49mm (49mm H x 44mm W x 14.4mm D)
Case Material:Aerospace-grade titanium (Natural or Black)
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Key spec differences
Only the specs that differ are shown here. Winners are highlighted when the data is clear.
Winner= clear advantage
Spec
Amazfit T-Rex 3
Apple Watch Ultra 3
Display2 specs
Display SizeKey
Amazfit T-Rex 3
1.5 in (38.1 mm) diameter
Apple Watch Ultra 3
1245 sq mm display area
Resolution
Amazfit T-Rex 3
480 x 480 pixels (322 ppi)
Apple Watch Ultra 3
422 x 514 pixels (326 ppi)
Performance1 specs
Storage
Amazfit T-Rex 3
32GB (Approx. 26GB user-accessible for Music/Maps)
Apple Watch Ultra 3
64GBWinner
Battery1 specs
Battery CapacityKey
Amazfit T-Rex 3
700 mAh; Up to 27 days (Typical usage); Up to 13 days (Heavy usage); Up to 42 hours (Accuracy GPS mode); Up to 114 hours (GPS Long Battery Life)
Apple Watch Ultra 3
Up to 36 hours (normal use); Up to 72 hours (Low Power Mode)
Design2 specs
Weight
Amazfit T-Rex 3
68.3 g (without strap)
Apple Watch Ultra 3
61.8 gWinner
Water Resistance
Amazfit T-Rex 3
10 ATM (100 meters); Freediving certified (EN13319) to 45m
Apple Watch Ultra 3
100 m (ISO 22810); EN13319 recreational scuba diving to 40 m (130 ft)
Software1 specs
Operating System
Amazfit T-Rex 3
Zepp OS 4
Apple Watch Ultra 3
watchOS
Connectivity1 specs
Connectivity
Amazfit T-Rex 3
Wi-Fi (2.4GHz); Bluetooth 5.2; BLE
Apple Watch Ultra 3
LTE and UMTS; Wi-Fi 4 (802.11n); Bluetooth 5.3; U2 Ultra Wideband chip
+Full specs, pros, and cons
Everything side-by-side with ratings and the full spec list.
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Full specs, pros, and cons
Everything side-by-side with ratings and the full spec list.
Comparison: Amazfit T-Rex 3 vs Apple Watch Ultra 3
Amazfit T-Rex 3
★4.5(1,926)Amazon
Apple Watch Ultra 3
★4.7(425)Amazon
| Criterion | Amazfit T-Rex 3 | Apple Watch Ultra 3 |
|---|---|---|
| Rating | ★4.5(1,926)Amazon | ★4.7(425)Amazon |
Compatibility | Android 7.0 or later; iOS 14.0 or later (Zepp App required) | iPhone Xs or later (incl. iPhone SE 2nd gen+) with iOS 18 or later |
Operating System | Zepp OS 4 | watchOS |
Case Size | 48.5mm x 48.5mm x 13.75mm | 49mm (49mm H x 44mm W x 14.4mm D) |
Case Material | Polymer middle frame; Stainless steel bezel (316L) | Aerospace-grade titanium (Natural or Black) |
Display Type | AMOLED; Gorilla Glass; Peak brightness 2000 nits | Always-On Retina display (LTPO3 OLED) with flat sapphire crystal |
Display Size | 1.5 in (38.1 mm) diameter | 1245 sq mm display area |
Resolution | 480 x 480 pixels (322 ppi) | 422 x 514 pixels (326 ppi) |
Always On Display | Yes | Yes |
Water Resistance | 10 ATM (100 meters); Freediving certified (EN13319) to 45m | 100 m (ISO 22810); EN13319 recreational scuba diving to 40 m (130 ft) |
Durability | MIL-STD-810H (70°C heat / -30°C cold / Shock / Humidity); Mud-resistant bridge and buttons | IP6X dust resistance; MIL-STD 810H tested |
GPS | Dual-band GNSS (L1+L5); 6 Satellite Positioning Systems (GPS, GLONASS, Galileo, BeiDou, QZSS, NAVIC) | Precision dual-frequency GPS (L1 and L5) |
Connectivity | Wi-Fi (2.4GHz); Bluetooth 5.2; BLE | LTE and UMTS; Wi-Fi 4 (802.11n); Bluetooth 5.3; U2 Ultra Wideband chip |
NFC Payments | Zepp Pay (Europe/parts of Asia only); Not supported on US models | Apple Pay |
Sensors | BioTracker™ 6.0 PPG biometric sensor (SpO2, Heart Rate); Accelerometer; Gyroscope; Geomagnetic sensor; Barometric altimeter; Ambient light sensor; Temperature sensor (skin/water) | Electrical heart (ECG), optical heart (Gen 3), temperature (body/water), blood oxygen, depth gauge, altimeter, accelerometer, gyroscope |
Health Features | Readiness Score; HRV (Heart Rate Variability); Sleep Breathing Quality; One-tap measuring (HR, SpO2, Stress, Breathing rate); Sleep stages (REM/Deep/Light); PAI Health Assessment | ECG, Blood Oxygen, Heart Rate zones, Sleep Tracking/Apnea notifications, Vitals app, Cycle Tracking with retrospective ovulation estimates |
Workout Modes | Hyrox Race mode; Ultramarathon; Freediving; Strength Training (auto-detection of 25 movements); Triathlon; Skiing; Snowboarding; Surf; and 170+ others | Multisport, Running (Advanced Metrics), Hiking (Topographic Maps), Ocean Diving, Swimming, Cycling |
Storage | 32GB (Approx. 26GB user-accessible for Music/Maps) | 64GB |
Speaker Mic | Microphone (for Zepp Flow voice commands); No Speaker (Buzzer/Beeper only for alerts) | Dual speakers; three-microphone array with beamforming and wind noise mitigation; 86dB Siren |
Calls | No (Cannot answer calls on wrist; can reject/ignore calls) | Yes (via Cellular or Wi-Fi) |
Battery | 700 mAh; Up to 27 days (Typical usage); Up to 13 days (Heavy usage); Up to 42 hours (Accuracy GPS mode); Up to 114 hours (GPS Long Battery Life) | Up to 36 hours (normal use); Up to 72 hours (Low Power Mode) |
Charging | Magnetic charging base (2-pin); Approx. 3 hours to full charge | Fast charging (0–80% in approx. 1 hour) with USB-C Magnetic Fast Charger |
Weight | 68.3 g (without strap) | 61.8 g |
Band Sizes | 22mm width; Fits 145–210mm wrists (Proprietary screws but includes adapters for standard bands in some regions) | Fits 130–210mm wrists (Alpine Loop, Trail Loop, Ocean Band) |
Extras | Offline Maps (Contour/Terrain); Turn-by-turn navigation; Zepp Flow (AI voice assistant); Night Display mode; Glove mode | S10 SiP, Double Tap gesture, On-device Siri, Precision Finding for iPhone, Flashlight/Night Mode, Crash Detection, Fall Detection |
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Amazfit T-Rex 3
Rating:★4.5(1,926)Amazon
Compatibility:Android 7.0 or later; iOS 14.0 or later (Zepp App required)
Operating System:Zepp OS 4
Case Size:48.5mm x 48.5mm x 13.75mm
Case Material:Polymer middle frame; Stainless steel bezel (316L)
Display Type:AMOLED; Gorilla Glass; Peak brightness 2000 nits
Display Size:1.5 in (38.1 mm) diameter
Resolution:480 x 480 pixels (322 ppi)
Always On Display:Yes
Water Resistance:10 ATM (100 meters); Freediving certified (EN13319) to 45m
Durability:MIL-STD-810H (70°C heat / -30°C cold / Shock / Humidity); Mud-resistant bridge and buttons
GPS:Dual-band GNSS (L1+L5); 6 Satellite Positioning Systems (GPS, GLONASS, Galileo, BeiDou, QZSS, NAVIC)
Connectivity:Wi-Fi (2.4GHz); Bluetooth 5.2; BLE
NFC Payments:Zepp Pay (Europe/parts of Asia only); Not supported on US models
Sensors:BioTracker™ 6.0 PPG biometric sensor (SpO2, Heart Rate); Accelerometer; Gyroscope; Geomagnetic sensor; Barometric altimeter; Ambient light sensor; Temperature sensor (skin/water)
Health Features:Readiness Score; HRV (Heart Rate Variability); Sleep Breathing Quality; One-tap measuring (HR, SpO2, Stress, Breathing rate); Sleep stages (REM/Deep/Light); PAI Health Assessment
Workout Modes:Hyrox Race mode; Ultramarathon; Freediving; Strength Training (auto-detection of 25 movements); Triathlon; Skiing; Snowboarding; Surf; and 170+ others
Storage:32GB (Approx. 26GB user-accessible for Music/Maps)
Speaker Mic:Microphone (for Zepp Flow voice commands); No Speaker (Buzzer/Beeper only for alerts)
Calls:No (Cannot answer calls on wrist; can reject/ignore calls)
Battery:700 mAh; Up to 27 days (Typical usage); Up to 13 days (Heavy usage); Up to 42 hours (Accuracy GPS mode); Up to 114 hours (GPS Long Battery Life)
Charging:Magnetic charging base (2-pin); Approx. 3 hours to full charge
Weight:68.3 g (without strap)
Band Sizes:22mm width; Fits 145–210mm wrists (Proprietary screws but includes adapters for standard bands in some regions)
Extras:Offline Maps (Contour/Terrain); Turn-by-turn navigation; Zepp Flow (AI voice assistant); Night Display mode; Glove mode
✓ Pros:
- • Incredible 27-day battery life crushes the competition
- • Large, bright 1.5" AMOLED (2000 nits) is easy to read outdoors
- • Free offline contour maps with turn-by-turn navigation
- • Freediving certified to 45m (rare at this price point)
- • Generous 32GB storage for offline music and global maps
✗ Cons:
- • No built-in speaker (alerts are beeps/vibrations only)
- • NFC payments (Zepp Pay) are not supported on US hardware
- • Large 48.5mm case is bulky for smaller wrists
- • Proprietary strap system requires adapters to use standard bands
As an Amazon Associate I earn from qualifying purchases.
Check Price on Amazon→
Apple Watch Ultra 3
Rating:★4.7(425)Amazon
Compatibility:iPhone Xs or later (incl. iPhone SE 2nd gen+) with iOS 18 or later
Operating System:watchOS
Case Size:49mm (49mm H x 44mm W x 14.4mm D)
Case Material:Aerospace-grade titanium (Natural or Black)
Display Type:Always-On Retina display (LTPO3 OLED) with flat sapphire crystal
Display Size:1245 sq mm display area
Resolution:422 x 514 pixels (326 ppi)
Always On Display:Yes
Water Resistance:100 m (ISO 22810); EN13319 recreational scuba diving to 40 m (130 ft)
Durability:IP6X dust resistance; MIL-STD 810H tested
GPS:Precision dual-frequency GPS (L1 and L5)
Connectivity:LTE and UMTS; Wi-Fi 4 (802.11n); Bluetooth 5.3; U2 Ultra Wideband chip
NFC Payments:Apple Pay
Sensors:Electrical heart (ECG), optical heart (Gen 3), temperature (body/water), blood oxygen, depth gauge, altimeter, accelerometer, gyroscope
Health Features:ECG, Blood Oxygen, Heart Rate zones, Sleep Tracking/Apnea notifications, Vitals app, Cycle Tracking with retrospective ovulation estimates
Workout Modes:Multisport, Running (Advanced Metrics), Hiking (Topographic Maps), Ocean Diving, Swimming, Cycling
Storage:64GB
Speaker Mic:Dual speakers; three-microphone array with beamforming and wind noise mitigation; 86dB Siren
Calls:Yes (via Cellular or Wi-Fi)
Battery:Up to 36 hours (normal use); Up to 72 hours (Low Power Mode)
Charging:Fast charging (0–80% in approx. 1 hour) with USB-C Magnetic Fast Charger
Weight:61.8 g
Band Sizes:Fits 130–210mm wrists (Alpine Loop, Trail Loop, Ocean Band)
Extras:S10 SiP, Double Tap gesture, On-device Siri, Precision Finding for iPhone, Flashlight/Night Mode, Crash Detection, Fall Detection
✓ Pros:
- • Class-leading 3,000-nit display brightness
- • Rugged titanium build with 100m water resistance
- • Excellent battery life relative to category (up to 72h low power)
- • Precision dual-frequency GPS ideal for outdoor sports
✗ Cons:
- • Large 49mm case may be too bulky for smaller wrists
- • High price point
- • Exclusive to iPhone ecosystem
- • Minimal design changes from previous generation
As an Amazon Associate I earn from qualifying purchases.
Check Price on Amazon→
Which one is better?
The Apple Watch Ultra 3 is the better buy for most people—its class-leading 3,000-nit display crushes the Amazfit T-Rex 3's brightness.
Who should buy each?
Choose the Amazfit T-Rex 3 if: you want a battery that lasts weeks, need offline maps for outdoor adventures, or prefer a more budget-friendly watch. (2.41 oz weight, 32 GB storage)
Choose the Apple Watch Ultra 3 if: you want the best display possible, need cellular calls directly from your wrist, or prioritize advanced health tracking features. (2.18 oz weight, 64 GB storage)
Conclusion
There is no wrong answer here. Focus on the features you will use daily and pick the model that aligns with them.
Frequently Asked Questions
+Which has better value?
Amazfit T-Rex 3 excels if you value incredible 27-day battery life crushes the competition. Apple Watch Ultra 3 is better if you prioritize class-leading 3,000-nit display brightness. Pick based on your budget and daily use.
+Is this an independent review?
Yes. We use affiliate links for monetization, but recommendations are research-driven and unbiased.
+Do newer models exist?
Check release timelines from the manufacturers and compare pricing before you buy. We refresh this page when major updates land.
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