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Wearable comparison

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

Compare battery life, health tracking, display and fit.

Compared products
01Selected
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
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02
Amazfit T-Rex Ultra 2

Amazfit T-Rex Ultra 2

  • 89.2 g.
  • Screen: 480 × 480 pixels, 322 ppi.
  • Wi-Fi 4 support.
  • 870 mAh battery capacity.
  • Up to 64 GB storage.
KSh 85,000Out of Stock

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2 spaces available

AmazFit FalconKSh 63,000
Amazfit T-Rex 3 ProKSh 55,000
WHOOP LifeKSh 55,500
Google Pixel Watch 5 45mmKSh 64,000
Apple Watch Series 12 42mmKSh 64,000
Apple Watch Series 12 46mmKSh 70,000
Huawei Watch D3KSh 75,000
2 of 4 products

Our quick verdict

The Amazfit T-Rex Ultra 2 lasts longer between charges (up to 30 days), works with Android phones and iPhones and gives daily recovery and BioCharge scores, while the Samsung Galaxy Watch Ultra 2 47mm takes ECG heart-rhythm readings, is lighter to wear all day and has a brighter screen for outdoor use.

Display

Samsung Galaxy Watch Ultra 2 47mm
498 × 498 pixels
Amazfit T-Rex Ultra 2
480 × 480 pixels, 322 ppi

Battery capacity

Samsung Galaxy Watch Ultra 2 47mm
800 mAh battery capacity
Amazfit T-Rex Ultra 2
870 mAh battery capacity

Portability

Samsung Galaxy Watch Ultra 2 47mm
61.5 g
Amazfit T-Rex Ultra 2
89.2 g

Storage

Samsung Galaxy Watch Ultra 2 47mm
64 GB storage
Amazfit T-Rex Ultra 2
Up to 64 GB storage

Software

Samsung Galaxy Watch Ultra 2 47mm
Wear OS 7
Amazfit T-Rex Ultra 2
Works with the Zepp app

Key differences

The main differences to help you choose.

Samsung Galaxy Watch Ultra 2 47mm

  • Brighter display: up to 5,000 nits (vs 3,000).
  • Lighter: 61.5 g (vs 89.2 g).
  • ECG heart-rhythm readings.
  • Titanium case (vs plastic case).
  • Slimmer: 10.7 mm thick (vs 14.3 mm).
  • Dual-band Wi-Fi (vs 2.4 GHz only).

Amazfit T-Rex Ultra 2

  • Longer rated battery life: up to 30 days (vs 60 hours).
  • Bigger battery: 870 mAh (vs 800 mAh).
  • Works with Android phones and iPhones.
  • Daily recovery and BioCharge scores.
  • Rated for free diving to 45 m.

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
PrioritySamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
Battery lifeUp to 60 hours per charge870 mAh battery
Storage64 GB storageUp to 64 GB storage
Display1.52-inch OLED display1.5-inch OLED display, 322 ppi
SoftwareWear OS 7Works with the Zepp app
ConnectionsBluetooth 5.3Wi-Fi 4, Bluetooth 5.2
Battery capacity800 mAh battery870 mAh battery

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
Display1.52-inch Super AMOLED1.5-inch AMOLED
Screen resolution498 × 498 pixels480 × 480 pixels, 322 ppi
Display protectionSapphire crystalSapphire glass
Display features5000 nits (peak)Up to 3,000 nits peak brightness; Always-On Display

Connectivity

Connectivity specifications comparison
SpecificationSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
Network / cellularGSM / HSPA / LTE—
SIM / eSIMeSIM—
Wi-FiWi-Fi 2.4 GHz + 5 GHz2.4 GHz Wi-Fi (802.11 b/g/n)
BluetoothBluetooth 5.3Bluetooth 5.2 and BLE
NFCSupported—
Positioning / GNSSDual-frequency GPS, L1 + L5Built-in dual-band positioning; six satellite positioning systems; circularly polarised GPS antenna

Identity & design

Identity & design specifications comparison
SpecificationSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
BrandSamsungAmazfit
ModelSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
Announced2026, July 22—
Dimensions47.4 × 47.1 × 10.7 mm51 × 51 × 14.3 mm, excluding heart-rate sensor base
Weight61.5 g without band89.2 g with strap
Build materialsTitanium caseFibre-reinforced polymer case; Grade 5 titanium bezel, buttons and back panel
Strap / bandMarine silicone; PeakForm hybrid; Trail fabric26 mm silicone strap with classic pin buckle
Controls / buttonsTouchscreen; Home and Back buttons; customizable Quick ButtonFour physical buttons; sapphire-glass touchscreen
Wrist size—145–215 mm

Performance & software

Performance & software specifications comparison
SpecificationSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
ProcessorQualcomm Snapdragon Wear Elite, 3 nm—
CPU5-core—
RAM2 GB—
Storage64 GB64 GB total; 26.7 GB available
Operating systemWear OS 7; One UI 9 Watch—

Audio & communication

Audio & communication specifications comparison
SpecificationSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
SpeakerSupportedSupported
MicrophoneSupportedSupported
CallingBluetooth calling with a connected smartphone; standalone calling on LTE editionsBluetooth calling and call/text notifications through a connected smartphone

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
SensorsSamsung BioActive: optical heart-rate, electrical heart signal, bioelectrical impedance analysis; temperature; accelerometer; barometer; gyroscope; geomagnetic; light sensorBioTracker 6.0 PPG biometric sensor (5 photodiodes + 2 LEDs); accelerometer; gyroscope; geomagnetic sensor; barometric altimeter; ambient-light sensor; temperature sensor
Health & wellness featuresHeart rate; SpO₂; ECG; body composition; temperature; stress; Vitals; Heart Health Score24-hour heart-rate, blood-oxygen, stress and skin-temperature monitoring; one-tap measurement; HybridCharge, BioCharge and LifeLoad energy insights; VO₂ Max and health alerts
Sleep trackingSleep-stage tracking; sleep-apnea risk detection; sleep VitalsSleep HRV; sleep quality; stages including REM; daytime naps; sleep schedule; breathing quality; sleep score; RestoreIQ recovery insights
Sports / workout modesRunning; trail running; cycling; swimming; multisport and other automatic/manual workouts187 sports modes; smart recognition of 25 strength-training movements and 8 sports movements; HYROX race and training modes
Training & outdoor featuresDaily Cardio Load; Fitness Index; workout and recovery guidanceZepp Coach; PeakBeats; lactate threshold, Training Stress Balance, Training Load and Training Effect; offline maps; on-watch route planning, automatic rerouting, POI search, turn-by-turn navigation; golf maps; external heart-rate, running-power and cycling sensors
Safety & emergency features86 dB safety siren; automatic Fall Detection; Emergency SOS by five Home-button pressesTwo-colour flashlight with SOS/Boost modes; storm, high-altitude blood-oxygen and route-deviation alerts
Diving / depth featuresAutomatic depth, dive-time and water-temperature trackingFreediving and recreational scuba-diving support to 45 m; EN13319:2000, ISO 6425:2018 and GB/T 18828-2022 diving certifications; Bühlmann ZHL-16C decompression model

Battery & durability

Battery & durability specifications comparison
SpecificationSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
Battery capacity800 mAh870 mAh rated
Battery lifeUp to 60 hours with AOD onTypical use: up to 30 days; heavy use: 15 days; AOD: 10 days; accurate GPS: 50 h; power-saving GPS: 90 h; maximum GPS: 177 h; low-temperature mode with GPS: 40 h
ChargingFast wireless charging, WPC-basedMagnetic charging head; DC 5 V 1.5 A maximum input
Water resistance10 ATM; IP69K10 ATM; tested to ISO 22810:2010
Durability / certificationsMIL-STD-810H; EN13319MIL-STD-810H-2019; low-temperature operation down to −30 °C; SGS water-resistance test; certified diving standards

Compatibility

Compatibility specifications comparison
SpecificationSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
Phone compatibilityAndroid 13.0 or later; more than 1.5 GB RAM; Google Mobile ServicesAndroid 7.0 or later; iOS 15.0 or later
Companion appGalaxy Wearable; Samsung HealthZepp App
ColorsTitanium Silver; Titanium GrayBlack Magma

Additional specifications

Additional specifications specifications comparison
SpecificationSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex Ultra 2
Case materialTitanium—
Peak brightness5,000 nits peak—
Charging time100% in 90 minutes; 40% in 30 minutes—
Release statusAvailable. Released 2026, August 07—
Model numbersSM-L715F, SM-L715U—
Card slotNo—
CameraNo—
3.5 mm headphone jackNo—
USBNo—
RadioNo—
2G bandsGSM 850 / 900 / 1800 / 1900—
3G bandsHSDPA 850 / 900 / 1700(AWS) / 1900 / 2100—
4G bands1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 34, 38, 39, 40, 41, 66, 71—
Network speedHSPA, 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 offer up to 64 GB of storage.
  • Both have similar screen sizes (1.52 and 1.5 inches).
  • Both connect over Bluetooth.

In summary

Get the Amazfit T-Rex Ultra 2 if you want longer battery life and a choice of Android phone or iPhone, or the Samsung Galaxy Watch Ultra 2 47mm if you would rather have ECG heart-rhythm readings and a lighter watch for all-day wear.

Back to compared products ↑

In-stock alternatives

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 ↗Apple Watch UltraFor Amazfit T-Rex Ultra 2Apple Watch UltraView product ↗Apple Watch Series 12 46mmFor Amazfit T-Rex Ultra 2Apple Watch Series 12 46mmView product ↗

Related comparisons

AmazFit FalconSamsung Galaxy Watch Ultra 2 47mmAmazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mmWHOOP LifeSamsung Galaxy Watch Ultra 2 47mmSamsung Galaxy Watch Ultra 2 47mmGoogle Pixel Watch 5 45mmSamsung Galaxy Watch Ultra 2 47mmApple Watch Series 12 42mmSamsung Galaxy Watch Ultra 2 47mmApple Watch Series 12 46mmSamsung Galaxy Watch Ultra 2 47mmHuawei Watch D3
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