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Wearable comparison

AmazFit T-Rex Ultra vs Samsung Galaxy Watch Ultra

Compare battery life, health tracking, display and fit.

Compared products
01Selected
AmazFit T-Rex Ultra

AmazFit T-Rex Ultra

  • Screen: 454 × 454 pixels, 326 ppi.
  • Runs Zepp OS 3.5.
  • 500 mAh battery capacity.
  • 2.3 GB storage.
  • Bluetooth 5.0.
KSh 47,000Out of Stock
02
Samsung Galaxy Watch Ultra

Samsung Galaxy Watch Ultra

  • Screen: 480 × 480 pixels.
  • Exynos W1000, 3 nm processor.
  • 2 GB RAM in this version.
  • 32 GB storage in this version.
  • Runs Wear OS 5; One UI 6 Watch.
KSh 45,000In Stock
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2 spaces available

WHOOP Peak 5.0 SensorKSh 38,000
Amazfit T-Rex 3 ProKSh 55,000
Amazfit Balance 2KSh 39,000
Amazfit Balance 3KSh 48,000
Google Pixel Watch 4KSh 44,500
Samsung Galaxy Watch Ultra 2025KSh 44,000
Apple Watch Series 10KSh 47,000
2 of 4 products

Our quick verdict

The Samsung Galaxy Watch Ultra has a bigger battery (590 mAh), takes ECG heart-rhythm readings and is lighter to wear all day, while the AmazFit T-Rex Ultra lasts longer between charges (up to 20 days) and works with Android phones and iPhones.

Display

AmazFit T-Rex Ultra
454 × 454 pixels, 326 ppi
Samsung Galaxy Watch Ultra
480 × 480 pixels

Software

AmazFit T-Rex Ultra
Runs Zepp OS 3.5
Samsung Galaxy Watch Ultra
Runs Wear OS 5; One UI 6 Watch

Battery capacity

AmazFit T-Rex Ultra
500 mAh battery capacity
Samsung Galaxy Watch Ultra
590 mAh battery capacity

Portability

AmazFit T-Rex Ultra
89 g
Samsung Galaxy Watch Ultra
60.5 g

Storage

AmazFit T-Rex Ultra
2.3 GB storage
Samsung Galaxy Watch Ultra
32 GB storage

Key differences

The main differences to help you choose.

AmazFit T-Rex Ultra

  • Longer rated battery life: up to 20 days (vs 80 hours).
  • Works with Android phones and iPhones.

Samsung Galaxy Watch Ultra

  • Bigger battery: 590 mAh (vs 500 mAh).
  • Lighter: 60.5 g (vs 89 g).
  • ECG heart-rhythm readings.
  • Titanium case (vs stainless steel case).
  • More storage: 32 GB (vs 2.3 GB).
  • Speaker.

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 UltraSamsung Galaxy Watch Ultra
Battery life500 mAh batteryUp to 80 hours per charge
Storage2.3 GB storage32 GB storage
Display1.39-inch OLED display, 326 ppi1.5-inch OLED display
SoftwareZepp OS 3.5Wear OS 5
Battery capacity500 mAh battery590 mAh battery
Water resistance10 ATMIP68 water and dust resistance

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationAmazFit T-Rex UltraSamsung Galaxy Watch Ultra
Display1.39-inch AMOLED1.5-inch Super AMOLED
Screen resolution454 × 454 pixels, 326 ppi480 × 480 pixels
Display protectionGlassSapphire crystal
Display featuresUp to 1,000 nits; Always-On Display; 120+ watch facesFull-colour always-on display

Connectivity

Connectivity specifications comparison
SpecificationAmazFit T-Rex UltraSamsung Galaxy Watch Ultra
Wi-Fi2.4 GHz Wi-FiWi-Fi 2.4 GHz + 5 GHz
BluetoothBluetooth 5.0 BLEBluetooth 5.3
Positioning / GNSSBuilt-in dual-band L1/L5 positioning; six satellite 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 UltraSamsung Galaxy Watch Ultra
BrandAmazfitSamsung
ModelAmazfit T-Rex UltraSamsung Galaxy Watch Ultra
Dimensions47.3 × 47.3 × 13.45 mm, excluding heart-rate sensor base47.1 × 47.4 × 12.1 mm
Weight89 g without strap60.5 g without band
Build materials316L stainless-steel bezel, back panel, bridge and buttons; polymer-alloy middle frameTitanium case
Wrist size140–205 mm—
Strap / band22 mm silicone strap with classic pin buckle—
Controls / buttonsFour physical buttons; glass touchscreenTouchscreen; Quick button; Home and Back buttons
Announced—2024, July 10

Performance & software

Performance & software specifications comparison
SpecificationAmazFit T-Rex UltraSamsung Galaxy Watch Ultra
StorageUp to 2.3 GB available for music32 GB
Operating systemZepp OS 3.5Wear OS 5; One UI 6 Watch
Processor—Exynos W1000, 3 nm
CPU—5-core
GPU—Mali-G68
RAM—2 GB

Audio & communication

Audio & communication specifications comparison
SpecificationAmazFit T-Rex UltraSamsung Galaxy Watch Ultra
SpeakerNo built-in speaker; audio through connected Bluetooth headphonesSupported
Microphone—Supported
Calling—Bluetooth calling with a connected smartphone; standalone calling on LTE editions

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationAmazFit T-Rex UltraSamsung Galaxy Watch Ultra
SensorsBioTracker PPG biometric sensor with SpO₂; accelerometer; gyroscope; geomagnetic sensor; barometric altimeter; ambient-light sensorSamsung BioActive: optical heart-rate, electrical heart signal, bioelectrical impedance analysis; temperature; accelerometer; barometer; gyroscope; geomagnetic; light sensor
Health & wellness features24-hour heart-rate, blood-oxygen and stress monitoring; one-tap measurement; PAI; breathing exercises; health alertsHeart-rate monitoring, ECG, blood pressure, body composition, blood oxygen, skin temperature and Energy Score; availability varies by market and paired phone
Sleep trackingSleep stages including REM; naps; sleep schedule; breathing quality; sleep scoreSleep tracking, sleep coaching and sleep-apnoea features where available
Sports / workout modes162 sports modes; smart recognition of 25 strength movements and 8 sports movements; freediving workoutsMultiple workout modes including multisport and automatic workout detection
Training & outdoor featuresOffline maps and route navigation; Zepp Coach; PeakBeats; Track Run; trajectory correction; Virtual Pacer; training templates and intervals; external heart-rate belt and cycling power meter; altitude, sun, moon and tide toolsDual-frequency GPS; GPX routes; Track Back; personalised heart-rate zones; Functional Threshold Power
Safety & emergency featuresStorm warnings; altitude blood-oxygen reminders; abnormal heart-rate, low-SpO₂ and high-stress alertsFall detection, SOS and siren features when configured
Diving / depth featuresOutdoor and indoor freediving and spearfishing; depth and water-temperature data; rated to 30 m; EN13319 and ISO 6425 diving certifications—

Battery & durability

Battery & durability specifications comparison
SpecificationAmazFit T-Rex UltraSamsung Galaxy Watch Ultra
Battery capacity500 mAh rated590 mAh
Battery lifeTypical: up to 20 days; saver: 25 days; clock: 50 days; heavy: 9 days; accuracy GPS: 28 h; automatic GPS: 46 h; power-saving GPS: 58 h; endurance GPS: 80 h; low-temperature GPS: 10 hUp to 80 hours with Always-On Display off; up to 60 hours with Always-On Display on; up to 100 hours in Power Saving Mode
ChargingMagnetic charging base; approximately 2 hoursFast wireless charging, WPC-based
Water resistance10 ATM; ISO 22810:201010 ATM; IP68
Durability / certificationsMud-resistant design; ultra-low-temperature mode down to −30 °C; SGS-certified 10 ATM testing; EN13319 and ISO 6425 diving certificationsMIL-STD-810H

Compatibility

Compatibility specifications comparison
SpecificationAmazFit T-Rex UltraSamsung Galaxy Watch Ultra
Phone compatibilityAndroid 7.0 or later; iOS 12.0 or laterAndroid 11.0 or later; more than 1.5 GB RAM
Companion appZepp AppGalaxy Wearable; Samsung Health
ColorsAbyss Black; SaharaTitanium Silver; Titanium Gray; Titanium White

Additional specifications

Additional specifications specifications comparison
SpecificationAmazFit T-Rex UltraSamsung Galaxy Watch Ultra
Case material—Titanium
Release status—Available. Released 2024, July 24
Model numbers—SM-L705F, SM-L705N, SM-L705U
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, 40, 66, 71
Network speed—HSPA, LTE
SAR (EU)—0.11 W/kg (head) 0.36 W/kg (body)

Similarities

  • Both are water resistant to 100 m.
  • Both have OLED displays.
  • Both have similar screen sizes (1.39 and 1.5 inches).
  • Both connect over Bluetooth.

In summary

Get the Samsung Galaxy Watch Ultra if you want a bigger battery and ECG heart-rhythm readings, or the AmazFit T-Rex Ultra if you would rather have longer battery life and a choice of Android phone or iPhone.

Back to compared products ↑

In-stock alternatives

Apple Watch Series 10For AmazFit T-Rex UltraApple Watch Series 10View product ↗Amazfit Balance 3For AmazFit T-Rex UltraAmazfit Balance 3View product ↗Google Pixel Watch 4For Samsung Galaxy Watch UltraGoogle Pixel Watch 4View product ↗Samsung Galaxy Watch Ultra 2025For Samsung Galaxy Watch UltraSamsung Galaxy Watch Ultra 2025View product ↗

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AmazFit T-Rex UltraWHOOP Peak 5.0 SensorAmazFit T-Rex UltraAmazfit T-Rex 3 ProAmazFit T-Rex UltraAmazfit Balance 2AmazFit T-Rex UltraAmazfit Balance 3AmazFit T-Rex UltraGoogle Pixel Watch 4AmazFit T-Rex UltraSamsung Galaxy Watch Ultra 2025AmazFit T-Rex UltraApple Watch Series 10AmazFit T-Rex UltraHuawei Watch 6 Pro 46 mmAmazFit FalconAmazFit T-Rex Ultra
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