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Wearable comparison

Amazfit T-Rex 3 vs Samsung Galaxy Watch 8 Classic

Compare battery life, health tracking, display and fit.

Compared products
01Selected
Amazfit T-Rex 3

Amazfit T-Rex 3

  • Screen: 480 × 480 pixels; 322 ppi.
  • Runs Zepp OS 6.
  • 700 mAh battery capacity.
  • Bluetooth 5.2.
  • 10 ATM.
KSh 32,700In Stock
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02
Samsung Galaxy Watch 8 Classic

Samsung Galaxy Watch 8 Classic

  • Screen: 438 × 438 pixels.
  • Exynos W1000, 3 nm processor.
  • 2 GB RAM in this version.
  • 64 GB storage in this version.
  • Runs Wear OS 6; One UI 8 Watch.
KSh 38,000In Stock
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2 spaces available

Xiaomi Watch 5KSh 30,000
Huawei Watch GT Runner 2KSh 37,000
Google Pixel Watch 5 41mmKSh 42,000
Amazfit Balance 2KSh 40,900
AmazFit CheetahKSh 29,500
Huawei Watch GT 5 ProKSh 34,000
Huawei Watch GT 6 ProKSh 33,500
2 of 4 products

Our quick verdict

The Amazfit T-Rex 3 lasts longer between charges (up to 27 days), works with Android phones and iPhones and has a larger 1.5-inch, sharper screen, while the Samsung Galaxy Watch 8 Classic is lighter to wear all day and has a brighter screen for outdoor use and a sturdier stainless steel build.

Display

Amazfit T-Rex 3
480 × 480 pixels; 322 ppi
Samsung Galaxy Watch 8 Classic
438 × 438 pixels

Software

Amazfit T-Rex 3
Runs Zepp OS 6
Samsung Galaxy Watch 8 Classic
Runs Wear OS 6; One UI 8 Watch

Battery capacity

Amazfit T-Rex 3
700 mAh battery capacity
Samsung Galaxy Watch 8 Classic
445 mAh battery capacity

Portability

Amazfit T-Rex 3
68.3 g
Samsung Galaxy Watch 8 Classic
63.5 g

Connections

Amazfit T-Rex 3
Bluetooth 5.2
Samsung Galaxy Watch 8 Classic
Bluetooth 5.3

Key differences

The main differences to help you choose.

Amazfit T-Rex 3

  • Longer rated battery life: up to 27 days (vs 40 hours).
  • Bigger battery: 700 mAh (vs 445 mAh).
  • Larger 1.5-inch screen (vs 1.34-inch).
  • Works with Android phones and iPhones.
  • Swimproof: water resistant to 100 m (vs 50 m).
  • Lower price: KSh 32,700 (vs KSh 38,000).

Samsung Galaxy Watch 8 Classic

  • Brighter display: up to 3,000 nits (vs 2,000).
  • Lighter: 63.5 g (vs 68.3 g).
  • Stainless steel case (vs plastic case).
  • Speaker.
  • Bluetooth calling with a connected smartphone.
  • Slimmer: 10.6 mm thick (vs 13.75 mm).

What matters most to you?

Choose any priorities

How each product answers the questions buyers ask most. Tick a topic to add it, untick one to hide it.

6 priorities selected.
How each product answers the selected priorities
PriorityAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
Battery life700 mAh batteryUp to 40 hours per charge
Display1.5-inch OLED display, 322 ppi1.34-inch OLED display
SoftwareZepp OS 6Wear OS 6
Battery capacity700 mAh battery445 mAh battery
ConnectionsBluetooth 5.2Bluetooth 5.3
Water resistance10 ATMIP68 water and dust resistance

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
Display1.5-inch AMOLED1.34-inch Super AMOLED
Screen resolution480 × 480 pixels; 322 ppi438 × 438 pixels
Display protectionCorning Gorilla GlassSapphire crystal
Display features—Full-colour always-on display

Connectivity

Connectivity specifications comparison
SpecificationAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
Wi-FiWi-Fi 2.4 GHzWi-Fi 2.4 GHz + 5 GHz
BluetoothBluetooth 5.2 BLEBluetooth 5.3
Positioning / GNSSDual-band GNSS; 6 satellite positioning systemsDual-frequency GPS, L1 + L5; GLONASS; BeiDou; Galileo
Network / cellular—GSM / HSPA / LTE
SIM / eSIM—eSIM
NFC—Supported

Identity & design

Identity & design specifications comparison
SpecificationAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
BrandAmazfitSamsung
ModelAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
Dimensions48.5 × 48.5 × 13.75 mm without heart-rate sensor base46.4 × 46.0 × 10.6 mm
Weight68.3 g without strap63.5 g without band
Build materialsStainless-steel bezel; polymer middle frameStainless-steel case
Wrist size145–210 mm—
Strap / band22 mm liquid silicone; pin buckle—
Controls / buttons4 physical buttons; touchscreenRotating bezel; Quick Button; Home and Back buttons
Announced—2025, July 09

Performance & software

Performance & software specifications comparison
SpecificationAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
Operating systemZepp OS 6Wear OS 6; One UI 8 Watch
Processor—Exynos W1000, 3 nm
CPU—5-core
GPU—Mali-G68
RAM—2 GB
Storage—64 GB

Audio & communication

Audio & communication specifications comparison
SpecificationAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
SpeakerUnsupportedSupported
MicrophoneSupportedSupported
CallingUnsupportedBluetooth calling with a connected smartphone; standalone calling on LTE editions

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
SensorsBioTracker 6.0 PPG; accelerometer; gyroscope; geomagnetic sensor; barometric altimeter; ambient light; temperatureSamsung BioActive: optical heart-rate, electrical heart signal, bioelectrical impedance analysis; temperature; accelerometer; barometer; gyroscope; geomagnetic; light sensor; 3D Hall sensor
Health & wellness features24-hour heart rate, SpO₂ and stress; one-tap measurement; PAI; breathing exercises; high and low heart-rate alerts; low SpO₂ alerts; high-altitude SpO₂ remindersHeart and wellness tracking; Antioxidant Index, Vascular Load, Energy Score and stress features. Availability varies by market and paired phone.
Sleep trackingSleep stages including REM; naps; sleep breathing quality; sleep scoreSleep tracking, sleep coaching, Bedtime Guidance and sleep-apnoea features where available
Sports / workout modes177 sports modes—
Training & outdoor featuresZepp Coach; PeakBeats; training templates; interval training; track running; trajectory correction; virtual pacer; offline maps; turn-by-turn navigation; route import; return navigation; route-deviation alerts; altitude assistant; compass; sunrise and sunset; moon phase; tides; storm warningsRunning Coach and dual-frequency route tracking
Diving / depth featuresFreediving to 45 m—

Battery & durability

Battery & durability specifications comparison
SpecificationAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
Battery capacity700 mAh rated445 mAh
Battery life27 days typical; 13 days heavy; 40 days Battery Saver; 81 days clock; 42 hours accurate GPS; 72 hours GPS power saver; 180 hours maximum GPSAlways-On Display off: up to 40 hours Always-On Display on: up to 30 hours
ChargingMagnetic charging headFast wireless charging, WPC-based
Water resistance10 ATM5 ATM; IP68
Durability / certificationsEN 13319; ISO 6425; GB/T 18828 diving certificationsMIL-STD-810H

Compatibility

Compatibility specifications comparison
SpecificationAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
Phone compatibilityAndroid 7 or later; iOS 14 or laterAndroid 12.0 or later; more than 1.5 GB RAM
Companion appZeppGalaxy Wearable; Samsung Health
ColorsOnyx; Lava; GrayBlack; White

Additional specifications

Additional specifications specifications comparison
SpecificationAmazfit T-Rex 3Samsung Galaxy Watch 8 Classic
Case materialStainless-steel bezel; polymer frameStainless steel
Pixels per inch322 ppi—
Peak brightness2,000 nits peak3,000 nits peak
Charging timeApproximately 3 hours—
Packing listWatch with standard strap; magnetic charging head; instruction manual—
Smart recognition25 strength-training movements; 8 sports movements—
Third-party fitness appsStrava; adidas Running; TrainingPeaks; komoot; Relive; Google Fit; Apple Health—
Release status—Available. Released 2025, July 25
Model numbers—SM-L500, SM-L505U
Card slot—No
Camera—No
3.5 mm headphone jack—No
USB—No
Radio—No
2G bands—GSM 850 / 900 / 1800 / 1900
3G bands—HSDPA 850 / 900 / 2100
4G bands—1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 40, 66, 71
Network speed—HSPA, LTE
SAR (US)—1.04 W/kg (head) 0.41 W/kg (body)
SAR (EU)—0.03 W/kg (head) 0.67 W/kg (body)
Additional durability features—Rotating bezel

Similarities

  • Both have OLED displays.
  • Both have similar screen sizes (1.5 and 1.34 inches).
  • Both connect over Bluetooth.
  • Both have a microphone.

In summary

Get the Amazfit T-Rex 3 if you want longer battery life and a choice of Android phone or iPhone, or the Samsung Galaxy Watch 8 Classic if you would rather have a lighter watch for all-day wear and a brighter screen for outdoor use.

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In-stock alternatives

OnePlus Watch 3For Amazfit T-Rex 3OnePlus Watch 3View product ↗Huawei Watch GT 6 ProFor Amazfit T-Rex 3Huawei Watch GT 6 ProView product ↗OnePlus Watch 4For Samsung Galaxy Watch 8 ClassicOnePlus Watch 4View product ↗Amazfit Balance 2For Samsung Galaxy Watch 8 ClassicAmazfit Balance 2View product ↗

Related comparisons

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