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2026 comparison
Updated Jan 16, 2026
|Sources: Amazon, ManufacturerAmazfit T-Rex 3 vs Garmin fēnix 8 (47mm AMOLED)
Amazfit T-Rex 3 vs Garmin fēnix 8 (47mm AMOLED): which is the right fit? We cover performance, value, and use cases to make the call easier.
Ratings: 4.5★ vs 4.6★
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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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Garmin fēnix 8 (47mm AMOLED)
★4.6
(1,856)•Amazon
Compatibility:iPhone, Android (Garmin Connect app required)
Operating System:Garmin OS (Proprietary)
Case Size:47mm x 47mm x 13.8mm
Case Material:Fiber-reinforced polymer with metal rear cover; Bezel: Titanium or Stainless Steel; Lens: Sapphire Crystal or Corning Gorilla Glass
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Comparison: Amazfit T-Rex 3 vs Garmin fēnix 8 (47mm AMOLED)
Amazfit T-Rex 3
★4.5(1,926)Amazon
Garmin fēnix 8 (47mm AMOLED)
★4.6(1,856)Amazon
| Criterion | Amazfit T-Rex 3 | Garmin fēnix 8 (47mm AMOLED) |
|---|---|---|
| Rating | ★4.5(1,926)Amazon | ★4.6(1,856)Amazon |
Compatibility | Android 7.0 or later; iOS 14.0 or later (Zepp App required) | iPhone, Android (Garmin Connect app required) |
Operating System | Zepp OS 4 | Garmin OS (Proprietary) |
Case Size | 48.5mm x 48.5mm x 13.75mm | 47mm x 47mm x 13.8mm |
Case Material | Polymer middle frame; Stainless steel bezel (316L) | Fiber-reinforced polymer with metal rear cover; Bezel: Titanium or Stainless Steel; Lens: Sapphire Crystal or Corning Gorilla Glass |
Display Type | AMOLED; Gorilla Glass; Peak brightness 2000 nits | AMOLED; Always-On Mode available; 1000 nits peak brightness |
Display Size | 1.5 in (38.1 mm) diameter | 1.4 in (35.56 mm) diameter |
Resolution | 480 x 480 pixels (322 ppi) | 454 x 454 pixels |
Always On Display | Yes | Yes (optional) |
Water Resistance | 10 ATM (100 meters); Freediving certified (EN13319) to 45m | 10 ATM (water pressure equivalent to 100 meters); Dive rated (EN13319) to 40 meters |
Durability | MIL-STD-810H (70°C heat / -30°C cold / Shock / Humidity); Mud-resistant bridge and buttons | MIL-STD-810H thermal/shock/water tested; Leakproof inductive buttons; Metal sensor guard |
GPS | Dual-band GNSS (L1+L5); 6 Satellite Positioning Systems (GPS, GLONASS, Galileo, BeiDou, QZSS, NAVIC) | Multi-band GNSS with SatIQ technology; GPS, GLONASS, Galileo, QZSS, BeiDou |
Connectivity | Wi-Fi (2.4GHz); Bluetooth 5.2; BLE | Bluetooth; ANT+; Wi-Fi |
NFC Payments | Zepp Pay (Europe/parts of Asia only); Not supported on US models | Garmin Pay |
Sensors | BioTracker™ 6.0 PPG biometric sensor (SpO2, Heart Rate); Accelerometer; Gyroscope; Geomagnetic sensor; Barometric altimeter; Ambient light sensor; Temperature sensor (skin/water) | Elevate Gen 5 optical heart rate sensor; Pulse Ox blood oxygen saturation monitor; Barometric altimeter; Compass; Gyroscope; Accelerometer; Thermometer; Ambient light sensor; Depth sensor (up to 40m) |
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 | Body Battery energy monitoring; Sleep Score and advanced sleep monitoring; HDR (High Dynamic Range) Heart Rate; HRV Status; Pulse Ox; Nap detection; Jet Lag Adviser; Health Snapshot |
Workout Modes | Hyrox Race mode; Ultramarathon; Freediving; Strength Training (auto-detection of 25 movements); Triathlon; Skiing; Snowboarding; Surf; and 170+ others | Advanced Strength Training (sport-specific); Recreational Scuba Diving (Single Gas); Apnea Diving; HIIT; Trail Run; Ultra Run; Triathlon; Skiing; Surfing; Golf (43,000+ courses); and 100+ others |
Storage | 32GB (Approx. 26GB user-accessible for Music/Maps) | 32GB |
Speaker Mic | Microphone (for Zepp Flow voice commands); No Speaker (Buzzer/Beeper only for alerts) | Built-in Speaker; Built-in Microphone (Voice Assistant & Voice Notes) |
Calls | No (Cannot answer calls on wrist; can reject/ignore calls) | Yes (Make and take calls via Bluetooth connection to smartphone) |
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) | Smartwatch mode: Up to 16 days (7 days always-on); GPS Only: Up to 47 hours (37 hours always-on); Expedition GPS: Up to 14 days |
Charging | Magnetic charging base (2-pin); Approx. 3 hours to full charge | Garmin proprietary plug charger (clip-on data cable) |
Weight | 68.3 g (without strap) | Stainless Steel: 80g (Case only: 59g); Titanium: 73g (Case only: 52g) |
Band Sizes | 22mm width; Fits 145–210mm wrists (Proprietary screws but includes adapters for standard bands in some regions) | Fits wrists 125–208mm (Silicone); QuickFit 22mm compatible |
Extras | Offline Maps (Contour/Terrain); Turn-by-turn navigation; Zepp Flow (AI voice assistant); Night Display mode; Glove mode | Built-in LED Flashlight (Red/White strobes); Dynamic Round-Trip Routing; Garmin Messenger app; Outdoor Maps+ (subscription optional); SkiView Maps |
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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→
Garmin fēnix 8 (47mm AMOLED)
Rating:★4.6(1,856)Amazon
Compatibility:iPhone, Android (Garmin Connect app required)
Operating System:Garmin OS (Proprietary)
Case Size:47mm x 47mm x 13.8mm
Case Material:Fiber-reinforced polymer with metal rear cover; Bezel: Titanium or Stainless Steel; Lens: Sapphire Crystal or Corning Gorilla Glass
Display Type:AMOLED; Always-On Mode available; 1000 nits peak brightness
Display Size:1.4 in (35.56 mm) diameter
Resolution:454 x 454 pixels
Always On Display:Yes (optional)
Water Resistance:10 ATM (water pressure equivalent to 100 meters); Dive rated (EN13319) to 40 meters
Durability:MIL-STD-810H thermal/shock/water tested; Leakproof inductive buttons; Metal sensor guard
GPS:Multi-band GNSS with SatIQ technology; GPS, GLONASS, Galileo, QZSS, BeiDou
Connectivity:Bluetooth; ANT+; Wi-Fi
NFC Payments:Garmin Pay
Sensors:Elevate Gen 5 optical heart rate sensor; Pulse Ox blood oxygen saturation monitor; Barometric altimeter; Compass; Gyroscope; Accelerometer; Thermometer; Ambient light sensor; Depth sensor (up to 40m)
Health Features:Body Battery energy monitoring; Sleep Score and advanced sleep monitoring; HDR (High Dynamic Range) Heart Rate; HRV Status; Pulse Ox; Nap detection; Jet Lag Adviser; Health Snapshot
Workout Modes:Advanced Strength Training (sport-specific); Recreational Scuba Diving (Single Gas); Apnea Diving; HIIT; Trail Run; Ultra Run; Triathlon; Skiing; Surfing; Golf (43,000+ courses); and 100+ others
Storage:32GB
Speaker Mic:Built-in Speaker; Built-in Microphone (Voice Assistant & Voice Notes)
Calls:Yes (Make and take calls via Bluetooth connection to smartphone)
Battery:Smartwatch mode: Up to 16 days (7 days always-on); GPS Only: Up to 47 hours (37 hours always-on); Expedition GPS: Up to 14 days
Charging:Garmin proprietary plug charger (clip-on data cable)
Weight:Stainless Steel: 80g (Case only: 59g); Titanium: 73g (Case only: 52g)
Band Sizes:Fits wrists 125–208mm (Silicone); QuickFit 22mm compatible
Extras:Built-in LED Flashlight (Red/White strobes); Dynamic Round-Trip Routing; Garmin Messenger app; Outdoor Maps+ (subscription optional); SkiView Maps
✓ Pros:
- • Stunning 1.4" AMOLED display with efficient 16-day battery life
- • Legitimate dive computer features (rated to 40m) with leakproof buttons
- • Built-in LED flashlight and speaker/mic add massive daily utility
- • Comprehensive offline mapping and best-in-class GPS accuracy
- • Advanced strength training plans tailored to specific sports
✗ Cons:
- • High price point compared to previous generations and competitors
- • No LTE/Cellular option for standalone calls (requires phone nearby)
- • Titanium models with Sapphire glass command a significant premium
- • Proprietary charging cable (not wireless/Qi standard)
As an Amazon Associate I earn from qualifying purchases.
Check Price on Amazon→
Which one is better?
Looking at user satisfaction (Garmin fēnix 8 (47mm AMOLED): 4.5★ vs Amazfit T-Rex 3: 4.6★), Garmin fēnix 8 (47mm AMOLED) pulls ahead. The gap is small—choose based on the priorities below.
Who should buy each?
Choose Amazfit T-Rex 3 if:
- You want Incredible 27-day battery life crushes the competition, Large, bright 1.5" AMOLED (2000 nits) is easy to read outdoors
- Rating: 4.5★ (1926 reviews)
Choose Garmin fēnix 8 (47mm AMOLED) if:
- You prefer Stunning 1.4" AMOLED display with efficient 16-day battery life, Legitimate dive computer features (rated to 40m) with leakproof buttons
- Rating: 4.6★ (1856 reviews)
Conclusion
Amazfit T-Rex 3 and Garmin fēnix 8 (47mm AMOLED) are both solid choices. Match the strengths above to your budget and workflow to make the best call.
Frequently Asked Questions
+Which has better value?
Amazfit T-Rex 3 excels if you value incredible 27-day battery life crushes the competition. Garmin fēnix 8 (47mm AMOLED) is better if you prioritize stunning 1.4" amoled display with efficient 16-day battery life. 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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