Skip to content

Wearable comparison

Amazfit T-Rex 3 Pro vs Samsung Galaxy Watch Ultra 2 47mm

Compare battery life, health tracking, display and fit.

Compared products
01Selected
Amazfit T-Rex 3 Pro

Amazfit T-Rex 3 Pro

  • Runs Zepp OS 6.
  • 1.5-inch OLED display, 322 ppi.
  • 48 mm: 700 mAh.
  • Bluetooth 5.2.
  • 10 ATM.
KSh 55,000In Stock
Choose options
02
Samsung Galaxy Watch Ultra 2 47mm

Samsung Galaxy Watch Ultra 2 47mm

  • Screen: 498 × 498 pixels.
  • Qualcomm Snapdragon Wear Elite, 3 nm processor.
  • 2 GB RAM in this version.
  • 64 GB storage in this version.
  • Runs Wear OS 7; One UI 9 Watch.
KSh 62,000In Stock
Add to cart

Add to comparison

2 spaces available

Apple Watch Series 11KSh 51,000
WHOOP Life MGKSh 50,000
Google Pixel Watch 5 45mmKSh 64,000
WHOOP LifeKSh 55,500
AmazFit FalconKSh 63,000
AmazFit T-Rex UltraKSh 47,000
Amazfit Balance 3KSh 48,000
2 of 4 products

Our quick verdict

The Samsung Galaxy Watch Ultra 2 47mm takes ECG heart-rhythm readings and has a brighter screen for outdoor use and a premium titanium build, while the Amazfit T-Rex 3 Pro works with Android phones and iPhones, is lighter to wear all day and is rated for free diving to 45 m.

Software

Amazfit T-Rex 3 Pro
Runs Zepp OS 6
Samsung Galaxy Watch Ultra 2 47mm
Runs Wear OS 7; One UI 9 Watch

Portability

Amazfit T-Rex 3 Pro
52 g
Samsung Galaxy Watch Ultra 2 47mm
61.5 g

Display

Amazfit T-Rex 3 Pro
1.5-inch OLED display, 322 ppi
Samsung Galaxy Watch Ultra 2 47mm
1.52-inch OLED display

Connections

Amazfit T-Rex 3 Pro
Bluetooth 5.2
Samsung Galaxy Watch Ultra 2 47mm
Bluetooth 5.3

Battery capacity

Amazfit T-Rex 3 Pro
48 mm: 700 mAh
Samsung Galaxy Watch Ultra 2 47mm
800 mAh battery

Key differences

The main differences to help you choose.

Amazfit T-Rex 3 Pro

  • Works with Android phones and iPhones.
  • Lighter: 52 g (vs 61.5 g).
  • Rated for free diving to 45 m.
  • Syncs with third-party apps such as Strava and Apple Health.

Samsung Galaxy Watch Ultra 2 47mm

  • Brighter display: up to 5,000 nits (vs 3,000).
  • ECG heart-rhythm readings.
  • Titanium case (vs plastic case).
  • Slimmer: 10.7 mm thick (vs 14 mm).
  • Dual-band Wi-Fi (vs 2.4 GHz only).

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.

More topicsFewer topics
6 priorities selected.
How each product answers the selected priorities
PriorityAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
Battery life48 mm: 25 days typical, 10 days heavy, 38 hours accurate GPSUp to 60 hours per charge
Portability52 g61.5 g
SoftwareZepp OS 6Wear OS 7
Display1.5-inch OLED display, 322 ppi1.52-inch OLED display
ConnectionsBluetooth 5.2Bluetooth 5.3
Battery capacity48 mm: 700 mAh800 mAh battery

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
Display48 mm: 1.5-inch; 44 mm: 1.32-inch AMOLED1.52-inch Super AMOLED
Screen resolution48 mm: 480 × 480 pixels, 322 ppi; 44 mm: 466 × 466 pixels, 353 ppi498 × 498 pixels
Display protectionSapphire glassSapphire crystal
Display features—5000 nits (peak)

Connectivity

Connectivity specifications comparison
SpecificationAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
Wi-FiWi-Fi 2.4 GHzWi-Fi 2.4 GHz + 5 GHz
BluetoothBluetooth 5.2 BLEBluetooth 5.3
Positioning / GNSSDual-band GNSS; 6 satellite systems; circularly polarized antennaDual-frequency GPS, L1 + L5
Network / cellular—GSM / HSPA / LTE
SIM / eSIM—eSIM
NFC—Supported

Identity & design

Identity & design specifications comparison
SpecificationAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
BrandAmazfitSamsung
ModelAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
Dimensions48 mm: 48 × 48 × 14 mm; 44 mm: 44.8 × 44.8 × 13.2 mm, without heart-rate sensor base47.4 × 47.1 × 10.7 mm
Weight48 mm: 52 g; 44 mm: 46.8 g, without strap61.5 g without band
Build materialsFibre-reinforced polymer case; Grade 5 titanium bezel and buttonsTitanium case
Wrist size48 mm: 145–210 mm; 44 mm: 140–205 mm—
Strap / band48 mm: 22 mm; 44 mm: 20 mm silicone quick-release strap; pin buckleMarine silicone; PeakForm hybrid; Trail fabric
Controls / buttons4 physical buttons; touchscreenTouchscreen; Home and Back buttons; customizable Quick Button
Announced—2026, July 22

Performance & software

Performance & software specifications comparison
SpecificationAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
Operating systemZepp OS 6Wear OS 7; One UI 9 Watch
Processor—Qualcomm Snapdragon Wear Elite, 3 nm
CPU—5-core
RAM—2 GB
Storage—64 GB

Audio & communication

Audio & communication specifications comparison
SpecificationAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
SpeakerSupportedSupported
MicrophoneSupportedSupported
CallingBluetooth callingBluetooth calling with a connected smartphone; standalone calling on LTE editions

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
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
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 reminders; skin temperature; HybridChargeHeart rate; SpO₂; ECG; body composition; temperature; stress; Vitals; Heart Health Score
Sleep trackingSleep stages including REM; naps; sleep breathing quality; sleep scoreSleep-stage tracking; sleep-apnea risk detection; sleep Vitals
Sports / workout modes187 sports modesRunning; trail running; cycling; swimming; multisport and other automatic/manual workouts
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 warnings; contour and ski maps; POI search; route planning; round-trip routing; auto rerouting; HYROX Virtual PaceDaily Cardio Load; Fitness Index; workout and recovery guidance
Diving / depth featuresFreediving to 45 m; recreational scuba-diving modeAutomatic depth, dive-time and water-temperature tracking
Safety & emergency features—86 dB safety siren; automatic Fall Detection; Emergency SOS by five Home-button presses

Battery & durability

Battery & durability specifications comparison
SpecificationAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
Battery capacity48 mm: 700 mAh; 44 mm: 500 mAh, rated800 mAh
Battery life48 mm: 25 days typical, 10 days heavy, 38 hours accurate GPS, 74 hours GPS power saver; 44 mm: 17 days typical, 8 days heavy, 26 hours accurate GPS, 51 hours GPS power saverUp to 60 hours with AOD on
ChargingMagnetic charging headFast wireless charging, WPC-based
Water resistance10 ATM10 ATM; IP69K
Durability / certificationsRugged outdoor construction with Grade 5 titanium controls and sapphire glassMIL-STD-810H; EN13319

Compatibility

Compatibility specifications comparison
SpecificationAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
Phone compatibilityAndroid 7 or later; iOS 15 or laterAndroid 13.0 or later; more than 1.5 GB RAM; Google Mobile Services
Companion appZeppGalaxy Wearable; Samsung Health
Colors48 mm: Tactical Black, Black Gold; 44 mm: Arctic Gold, Black GoldTitanium Silver; Titanium Gray

Additional specifications

Additional specifications specifications comparison
SpecificationAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mm
Case materialFibre-reinforced polymer; Grade 5 titanium bezelTitanium
FlashlightRed and white LED flashlight—
Pixels per inch48 mm: 322 ppi; 44 mm: 353 ppi—
Peak brightness3,000 nits peak5,000 nits peak
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—
Charging time—100% in 90 minutes; 40% in 30 minutes
Release status—Available. Released 2026, August 07
Model numbers—SM-L715F, SM-L715U
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 / 1700(AWS) / 1900 / 2100
4G bands—1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 34, 38, 39, 40, 41, 66, 71
Network speed—HSPA, LTE
SAR (US)—0.44 W/kg (body)
SAR (EU)—0.42 W/kg (body)

Similarities

  • Both are water resistant to 100 m.
  • Both take calls over Bluetooth.
  • Both have OLED displays.
  • Both have similar screen sizes (1.5 and 1.52 inches).
  • Both connect over Bluetooth.

In summary

Get the Samsung Galaxy Watch Ultra 2 47mm if you want ECG heart-rhythm readings, or the Amazfit T-Rex 3 Pro if you would rather have a choice of Android phone or iPhone.

Back to compared products ↑

In-stock alternatives

WHOOP LifeFor Amazfit T-Rex 3 ProWHOOP LifeView product ↗Apple Watch Series 11For Amazfit T-Rex 3 ProApple Watch Series 11View product ↗Google Pixel Watch 5 45mmFor Samsung Galaxy Watch Ultra 2 47mmGoogle Pixel Watch 5 45mmView product ↗Apple Watch Series 12 42mmFor Samsung Galaxy Watch Ultra 2 47mmApple Watch Series 12 42mmView product ↗

Related comparisons

Amazfit T-Rex 3 ProApple Watch Series 11Amazfit T-Rex 3 ProWHOOP Life MGAmazfit T-Rex 3 ProGoogle Pixel Watch 5 45mmAmazfit T-Rex 3 ProWHOOP LifeAmazFit FalconAmazfit T-Rex 3 ProAmazFit T-Rex UltraAmazfit T-Rex 3 ProAmazfit T-Rex 3 ProAmazfit Balance 3Amazfit T-Rex 3 ProAmazfit T-Rex Ultra 2Amazfit T-Rex 3 ProHuawei Watch 6 Pro 46 mm
Menu
Need Help? +254 112891117
Back to Top

My Cart