Skip to content

Wearable comparison

AmazFit T-Rex Ultra vs Amazfit T-Rex 3 Pro

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
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

Add to comparison

2 spaces available

WHOOP Peak 5.0 SensorKSh 38,000
Amazfit Balance 2KSh 39,000
Amazfit Balance 3KSh 48,000
Google Pixel Watch 4KSh 44,500
Samsung Galaxy Watch Ultra 2025KSh 44,000
Samsung Galaxy Watch UltraKSh 45,000
Apple Watch Series 10KSh 47,000
2 of 4 products

Our quick verdict

The Amazfit T-Rex 3 Pro lasts longer between charges (25 days typical), is lighter to wear all day and has a brighter screen for outdoor use, while the AmazFit T-Rex Ultra has a sturdier stainless steel build.

Software

AmazFit T-Rex Ultra
Runs Zepp OS 3.5
Amazfit T-Rex 3 Pro
Runs Zepp OS 6

Portability

AmazFit T-Rex Ultra
89 g
Amazfit T-Rex 3 Pro
52 g

Display

AmazFit T-Rex Ultra
1.39-inch OLED display, 326 ppi
Amazfit T-Rex 3 Pro
1.5-inch OLED display, 322 ppi

Battery capacity

AmazFit T-Rex Ultra
500 mAh battery
Amazfit T-Rex 3 Pro
48 mm: 700 mAh

Connections

AmazFit T-Rex Ultra
Bluetooth 5.0
Amazfit T-Rex 3 Pro
Bluetooth 5.2

Key differences

The main differences to help you choose.

AmazFit T-Rex Ultra

  • Stainless steel case (vs plastic case).
  • Charging: Magnetic charging base.

Amazfit T-Rex 3 Pro

  • Longer battery life: up to 25 days in typical use (vs 20).
  • Longer sport-mode battery: up to 38 hours in GPS mode (vs 28 hours in GPS: mode).
  • Brighter display: up to 3,000 nits (vs 1,000).
  • Lighter: 52 g (vs 89 g).
  • Rated for free diving to 45 m.
  • 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.

More topicsFewer topics
6 priorities selected.
How each product answers the selected priorities
PriorityAmazFit T-Rex UltraAmazfit T-Rex 3 Pro
Battery life500 mAh battery48 mm: 25 days typical, 10 days heavy, 38 hours accurate GPS
Portability89 g52 g
Display1.39-inch OLED display, 326 ppi1.5-inch OLED display, 322 ppi
SoftwareZepp OS 3.5Zepp OS 6
Battery capacity500 mAh battery48 mm: 700 mAh
ConnectionsBluetooth 5.0Bluetooth 5.2

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit T-Rex 3 Pro
Display1.39-inch AMOLED48 mm: 1.5-inch; 44 mm: 1.32-inch AMOLED
Screen resolution454 × 454 pixels, 326 ppi48 mm: 480 × 480 pixels, 322 ppi; 44 mm: 466 × 466 pixels, 353 ppi
Display protectionGlassSapphire glass
Display featuresUp to 1,000 nits; Always-On Display; 120+ watch faces—

Connectivity

Connectivity specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit T-Rex 3 Pro
Wi-Fi2.4 GHz Wi-FiWi-Fi 2.4 GHz
BluetoothBluetooth 5.0 BLEBluetooth 5.2 BLE
Positioning / GNSSBuilt-in dual-band L1/L5 positioning; six satellite systemsDual-band GNSS; 6 satellite systems; circularly polarized antenna

Identity & design

Identity & design specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit T-Rex 3 Pro
BrandAmazfitAmazfit
ModelAmazfit T-Rex UltraAmazfit T-Rex 3 Pro
Dimensions47.3 × 47.3 × 13.45 mm, excluding heart-rate sensor base48 mm: 48 × 48 × 14 mm; 44 mm: 44.8 × 44.8 × 13.2 mm, without heart-rate sensor base
Weight89 g without strap48 mm: 52 g; 44 mm: 46.8 g, without strap
Build materials316L stainless-steel bezel, back panel, bridge and buttons; polymer-alloy middle frameFibre-reinforced polymer case; Grade 5 titanium bezel and buttons
Wrist size140–205 mm48 mm: 145–210 mm; 44 mm: 140–205 mm
Strap / band22 mm silicone strap with classic pin buckle48 mm: 22 mm; 44 mm: 20 mm silicone quick-release strap; pin buckle
Controls / buttonsFour physical buttons; glass touchscreen4 physical buttons; touchscreen

Performance & software

Performance & software specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit T-Rex 3 Pro
StorageUp to 2.3 GB available for music—
Operating systemZepp OS 3.5Zepp OS 6

Audio & communication

Audio & communication specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit T-Rex 3 Pro
SpeakerNo built-in speaker; audio through connected Bluetooth headphonesSupported
Microphone—Supported
Calling—Bluetooth calling

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit T-Rex 3 Pro
SensorsBioTracker PPG biometric sensor with SpO₂; accelerometer; gyroscope; geomagnetic sensor; barometric altimeter; ambient-light sensorBioTracker 6.0 PPG; accelerometer; gyroscope; geomagnetic sensor; barometric altimeter; ambient light; temperature
Health & wellness features24-hour heart-rate, blood-oxygen and stress monitoring; one-tap measurement; PAI; breathing exercises; health alerts24-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; HybridCharge
Sleep trackingSleep stages including REM; naps; sleep schedule; breathing quality; sleep scoreSleep stages including REM; naps; sleep breathing quality; sleep score
Sports / workout modes162 sports modes; smart recognition of 25 strength movements and 8 sports movements; freediving workouts187 sports modes
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 toolsZepp 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 Pace
Safety & emergency featuresStorm warnings; altitude blood-oxygen reminders; abnormal heart-rate, low-SpO₂ and high-stress alerts—
Diving / depth featuresOutdoor and indoor freediving and spearfishing; depth and water-temperature data; rated to 30 m; EN13319 and ISO 6425 diving certificationsFreediving to 45 m; recreational scuba-diving mode

Battery & durability

Battery & durability specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit T-Rex 3 Pro
Battery capacity500 mAh rated48 mm: 700 mAh; 44 mm: 500 mAh, rated
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 h48 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 saver
ChargingMagnetic charging base; approximately 2 hoursMagnetic charging head
Water resistance10 ATM; ISO 22810:201010 ATM
Durability / certificationsMud-resistant design; ultra-low-temperature mode down to −30 °C; SGS-certified 10 ATM testing; EN13319 and ISO 6425 diving certificationsRugged outdoor construction with Grade 5 titanium controls and sapphire glass

Compatibility

Compatibility specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit T-Rex 3 Pro
Phone compatibilityAndroid 7.0 or later; iOS 12.0 or laterAndroid 7 or later; iOS 15 or later
Companion appZepp AppZepp
ColorsAbyss Black; Sahara48 mm: Tactical Black, Black Gold; 44 mm: Arctic Gold, Black Gold

Additional specifications

Additional specifications specifications comparison
SpecificationAmazFit T-Rex UltraAmazfit T-Rex 3 Pro
Case material—Fibre-reinforced polymer; Grade 5 titanium bezel
Flashlight—Red and white LED flashlight
Pixels per inch—48 mm: 322 ppi; 44 mm: 353 ppi
Peak brightness—3,000 nits peak
Packing list—Watch with standard strap; magnetic charging head; instruction manual
Smart recognition—25 strength-training movements; 8 sports movements
Third-party fitness apps—Strava; adidas Running; TrainingPeaks; komoot; Relive; Google Fit; Apple Health

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.
  • Both use 2.4 GHz Wi-Fi only.

In summary

For most buyers the Amazfit T-Rex 3 Pro is the better buy; the AmazFit T-Rex Ultra makes sense if you want a sturdier stainless steel build.

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 ↗Samsung Galaxy Watch Ultra 2 47mmFor Amazfit T-Rex 3 ProSamsung Galaxy Watch Ultra 2 47mmView product ↗

Related comparisons

AmazFit T-Rex UltraWHOOP Peak 5.0 SensorAmazFit 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 UltraSamsung Galaxy Watch UltraAmazFit T-Rex UltraApple Watch Series 10AmazFit T-Rex UltraHuawei Watch 6 Pro 46 mmAmazFit FalconAmazFit T-Rex Ultra
Menu
Need Help? +254 112891117
Back to Top

My Cart