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2026 comparison
Updated Jan 16, 2026
|Sources: Amazon, ManufacturerAmazfit T-Rex 3 vs Samsung Galaxy Watch 7
Choosing between Amazfit T-Rex 3 and Samsung Galaxy Watch 7 can be tricky. Both are excellent, but they serve different priorities. This guide highlights what matters for US shoppers.
Ratings: 4.5★ vs 4.5★
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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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Samsung Galaxy Watch 7
★4.5
(6,385)•Amazon
Compatibility:Android 11.0 or higher with 1.5GB+ RAM; Samsung Galaxy phone required for Energy Score, ECG, Sleep Apnea, and IHRN features
Operating System:Wear OS 5 powered by Samsung (One UI 6 Watch)
Case Size:44mm (44.4 x 44.4 x 9.7 mm) or 40mm (40.4 x 40.4 x 9.7 mm)
Case Material:Armor Aluminum 2 case; Sapphire Crystal glass
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Comparison: Amazfit T-Rex 3 vs Samsung Galaxy Watch 7
Amazfit T-Rex 3
★4.5(1,926)Amazon
Samsung Galaxy Watch 7
★4.5(6,385)Amazon
| Criterion | Amazfit T-Rex 3 | Samsung Galaxy Watch 7 |
|---|---|---|
| Rating | ★4.5(1,926)Amazon | ★4.5(6,385)Amazon |
Compatibility | Android 7.0 or later; iOS 14.0 or later (Zepp App required) | Android 11.0 or higher with 1.5GB+ RAM; Samsung Galaxy phone required for Energy Score, ECG, Sleep Apnea, and IHRN features |
Operating System | Zepp OS 4 | Wear OS 5 powered by Samsung (One UI 6 Watch) |
Case Size | 48.5mm x 48.5mm x 13.75mm | 44mm (44.4 x 44.4 x 9.7 mm) or 40mm (40.4 x 40.4 x 9.7 mm) |
Case Material | Polymer middle frame; Stainless steel bezel (316L) | Armor Aluminum 2 case; Sapphire Crystal glass |
Display Type | AMOLED; Gorilla Glass; Peak brightness 2000 nits | Super AMOLED; Always-On Display; Peak brightness 2000 nits |
Display Size | 1.5 in (38.1 mm) diameter | 1.5 in (44mm) / 1.3 in (40mm) |
Resolution | 480 x 480 pixels (322 ppi) | 480 x 480 pixels (44mm); 432 x 432 pixels (40mm) |
Always On Display | Yes | Yes |
Water Resistance | 10 ATM (100 meters); Freediving certified (EN13319) to 45m | 5 ATM + IP68 (water resistant up to 50 meters for 10 min) |
Durability | MIL-STD-810H (70°C heat / -30°C cold / Shock / Humidity); Mud-resistant bridge and buttons | MIL-STD-810H certified; Dust tight (IP68) |
GPS | Dual-band GNSS (L1+L5); 6 Satellite Positioning Systems (GPS, GLONASS, Galileo, BeiDou, QZSS, NAVIC) | Dual-frequency GPS (L1+L5); Glonass; Beidou; Galileo |
Connectivity | Wi-Fi (2.4GHz); Bluetooth 5.2; BLE | LTE (optional); Wi-Fi 2.4+5GHz; Bluetooth 5.3; NFC |
NFC Payments | Zepp Pay (Europe/parts of Asia only); Not supported on US models | Samsung Wallet / Google Wallet |
Sensors | BioTracker™ 6.0 PPG biometric sensor (SpO2, Heart Rate); Accelerometer; Gyroscope; Geomagnetic sensor; Barometric altimeter; Ambient light sensor; Temperature sensor (skin/water) | Samsung BioActive Sensor (Optical Bio-signal + Electrical Heart + Bioelectrical Impedance Analysis); Temperature sensor; Accelerometer; Barometer; Gyro sensor; Geomagnetic sensor; Light sensor |
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 | Energy Score; Sleep Apnea detection (FDA authorized); AGEs Index; Body Composition (BIA); ECG; Irregular Heart Rhythm Notification; Cycle Tracking with skin temperature; Sleep coaching |
Workout Modes | Hyrox Race mode; Ultramarathon; Freediving; Strength Training (auto-detection of 25 movements); Triathlon; Skiing; Snowboarding; Surf; and 170+ others | Advanced Run Coaching; Race (compete against past results); Track Back; Custom Interval Training; Swimming (Pool & Open Water); Cycling; Hiking; Circuit Training; and 100+ others via Samsung Health |
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) | Speaker; Microphone |
Calls | No (Cannot answer calls on wrist; can reject/ignore calls) | Yes (LTE standalone or via paired phone) |
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) | 425 mAh (44mm) / 300 mAh (40mm); Up to 40 hours (AOD off); Up to 30 hours (AOD on) |
Charging | Magnetic charging base (2-pin); Approx. 3 hours to full charge | Fast Wireless Charging (WPC Inductive); 0-45% in approx. 30 mins |
Weight | 68.3 g (without strap) | 33.8 g (44mm) / 28.8 g (40mm) (Body only) |
Band Sizes | 22mm width; Fits 145–210mm wrists (Proprietary screws but includes adapters for standard bands in some regions) | Fits 20mm standard bands (One Click system) |
Extras | Offline Maps (Contour/Terrain); Turn-by-turn navigation; Zepp Flow (AI voice assistant); Night Display mode; Glove mode | Exynos W1000 (3nm) Processor; Galaxy AI features (Smart Reply, Voice-to-Text summaries); Double Pinch gesture |
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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.
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Samsung Galaxy Watch 7
Rating:★4.5(6,385)Amazon
Compatibility:Android 11.0 or higher with 1.5GB+ RAM; Samsung Galaxy phone required for Energy Score, ECG, Sleep Apnea, and IHRN features
Operating System:Wear OS 5 powered by Samsung (One UI 6 Watch)
Case Size:44mm (44.4 x 44.4 x 9.7 mm) or 40mm (40.4 x 40.4 x 9.7 mm)
Case Material:Armor Aluminum 2 case; Sapphire Crystal glass
Display Type:Super AMOLED; Always-On Display; Peak brightness 2000 nits
Display Size:1.5 in (44mm) / 1.3 in (40mm)
Resolution:480 x 480 pixels (44mm); 432 x 432 pixels (40mm)
Always On Display:Yes
Water Resistance:5 ATM + IP68 (water resistant up to 50 meters for 10 min)
Durability:MIL-STD-810H certified; Dust tight (IP68)
GPS:Dual-frequency GPS (L1+L5); Glonass; Beidou; Galileo
Connectivity:LTE (optional); Wi-Fi 2.4+5GHz; Bluetooth 5.3; NFC
NFC Payments:Samsung Wallet / Google Wallet
Sensors:Samsung BioActive Sensor (Optical Bio-signal + Electrical Heart + Bioelectrical Impedance Analysis); Temperature sensor; Accelerometer; Barometer; Gyro sensor; Geomagnetic sensor; Light sensor
Health Features:Energy Score; Sleep Apnea detection (FDA authorized); AGEs Index; Body Composition (BIA); ECG; Irregular Heart Rhythm Notification; Cycle Tracking with skin temperature; Sleep coaching
Workout Modes:Advanced Run Coaching; Race (compete against past results); Track Back; Custom Interval Training; Swimming (Pool & Open Water); Cycling; Hiking; Circuit Training; and 100+ others via Samsung Health
Storage:32GB
Speaker Mic:Speaker; Microphone
Calls:Yes (LTE standalone or via paired phone)
Battery:425 mAh (44mm) / 300 mAh (40mm); Up to 40 hours (AOD off); Up to 30 hours (AOD on)
Charging:Fast Wireless Charging (WPC Inductive); 0-45% in approx. 30 mins
Weight:33.8 g (44mm) / 28.8 g (40mm) (Body only)
Band Sizes:Fits 20mm standard bands (One Click system)
Extras:Exynos W1000 (3nm) Processor; Galaxy AI features (Smart Reply, Voice-to-Text summaries); Double Pinch gesture
✓ Pros:
- • Significantly faster performance with new 3nm Exynos W1000 chip
- • Dual-frequency GPS improves tracking accuracy in cities
- • New health metrics: Sleep Apnea, AGEs Index, and Energy Score
- • Double the storage (32GB) compared to Watch 6
- • Lightweight and comfortable Armor Aluminum design
✗ Cons:
- • Battery life remains roughly 1 day with heavy use (requires daily charging)
- • Advanced health features (ECG, Apnea) strictly require Samsung phones
- • Charging speed is decent but slower than some competitors
- • Design is virtually identical to the previous generation
As an Amazon Associate I earn from qualifying purchases.
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Which one is better?
Looking at user satisfaction (Amazfit T-Rex 3: 4.5★ vs Samsung Galaxy Watch 7: 4.5★), Amazfit T-Rex 3 pulls ahead. The gap is small—choose based on the priorities below.
Who should buy each?
Amazfit T-Rex 3 excels at: Incredible 27-day battery life crushes the competition, Large, bright 1.5" AMOLED (2000 nits) is easy to read outdoors
Watch for: No built-in speaker (alerts are beeps/vibrations only)
Samsung Galaxy Watch 7 excels at: Significantly faster performance with new 3nm Exynos W1000 chip, Dual-frequency GPS improves tracking accuracy in cities
Watch for: Battery life remains roughly 1 day with heavy use (requires daily charging)
Conclusion
We hope this comparison helps you buy with confidence. Both products are dependable; the right one depends on how you will use it.
Frequently Asked Questions
+Which has better value?
Amazfit T-Rex 3 excels if you value incredible 27-day battery life crushes the competition. Samsung Galaxy Watch 7 is better if you prioritize significantly faster performance with new 3nm exynos w1000 chip. 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.
Affiliate disclosure
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