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Wearable comparison

Amazfit T-Rex Ultra 2 vs Apple Watch Ultra 4 49mm

Compare battery life, health tracking, display and fit.

Compared products
01Selected
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
02
Apple Watch Ultra 4 49mm

Apple Watch Ultra 4 49mm

  • 1.98 inch screen.
  • Apple S11 processor.
  • 64 GB storage in this version.
  • Runs watchOS 27.
  • Wi-Fi 4 support.
KSh 118,000In Stock
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Apple Watch Ultra 3KSh 90,000
Samsung Galaxy Watch Ultra 2 47mmKSh 62,000
Google Pixel Watch 5 45mmKSh 64,000
Amazfit T-Rex 3 ProKSh 55,000
Apple Watch UltraKSh 90,000
Apple Watch Ultra 2KSh 103,500
Huawei Watch D3KSh 75,000
2 of 4 products

Our quick verdict

The Apple Watch Ultra 4 49mm runs watchOS built around the iPhone, takes ECG heart-rhythm readings, is lighter to wear all day and has a larger 1.98-inch screen, though it works only with an iPhone, while the Amazfit T-Rex Ultra 2 lasts much longer between charges (30 days vs 50 hours), works with Android phones and iPhones and is rated for free diving to 45 m.

Display

Amazfit T-Rex Ultra 2
480 × 480 pixels, 322 ppi
Apple Watch Ultra 4 49mm
422 × 514 pixels; 326 ppi; 1,245 mm² display area

Battery capacity

Amazfit T-Rex Ultra 2
870 mAh battery capacity
Apple Watch Ultra 4 49mm
631 mAh battery capacity

Portability

Amazfit T-Rex Ultra 2
89.2 g
Apple Watch Ultra 4 49mm
63 g

Storage

Amazfit T-Rex Ultra 2
Up to 64 GB storage
Apple Watch Ultra 4 49mm
64 GB storage

Connections

Amazfit T-Rex Ultra 2
Wi-Fi 4, Bluetooth 5.2
Apple Watch Ultra 4 49mm
Wi-Fi 4, Bluetooth 5.3

Key differences

The main differences to help you choose.

Amazfit T-Rex Ultra 2

  • Longer battery life: up to 30 days (vs 50 hours).
  • Longer sport-mode battery: up to 50 hours in GPS: mode (vs 18 hours in workout tracking mode).
  • Bigger battery: 870 mAh (vs 631 mAh).
  • Works with Android phones and iPhones.
  • Rated for free diving to 45 m (vs 40 m).

Apple Watch Ultra 4 49mm

  • Larger 1.98-inch screen (vs 1.5-inch).
  • Lighter: 63 g (vs 89.2 g).
  • ECG heart-rhythm readings.
  • Titanium case and ceramic back (vs plastic case).
  • Blood-pressure (hypertension) notifications.
  • Slimmer: 12 mm thick (vs 14.3 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 Ultra 2Apple Watch Ultra 4 49mm
Battery life870 mAh batteryUp to 50 hours per charge
StorageUp to 64 GB storage64 GB storage
Display1.5-inch OLED display, 322 ppi1.98-inch OLED display, 326 ppi
ConnectionsWi-Fi 4, Bluetooth 5.2Wi-Fi 4, Bluetooth 5.3
Battery capacity870 mAh battery631 mAh battery
SoftwareWorks with the Zepp appwatchOS 27

Detailed comparison

Explore the full specifications, section by section.

Display

Display specifications comparison
SpecificationAmazfit T-Rex Ultra 2Apple Watch Ultra 4 49mm
Display1.5-inch AMOLEDRetina LTPO3 OLED, 3000 nits (peak); 1.98 inches
Screen resolution480 × 480 pixels, 322 ppi422 × 514 pixels; 326 ppi; 1,245 mm² display area
Display protectionSapphire glassSapphire crystal
Display featuresUp to 3,000 nits peak brightness; Always-On Display3000 nits (peak); Wide-angle OLED

Connectivity

Connectivity specifications comparison
SpecificationAmazfit T-Rex Ultra 2Apple Watch Ultra 4 49mm
Wi-Fi2.4 GHz Wi-Fi (802.11 b/g/n)Wi-Fi 802.11 b/g/n, dual-band
BluetoothBluetooth 5.2 and BLE5.3, A2DP, LE
Positioning / GNSSBuilt-in dual-band positioning; six satellite positioning systems; circularly polarised GPS antennaGPS (L1+L5), GLONASS, GALILEO, BDS, QZSS
Network / cellular—GSM / HSPA / LTE / 5G
SIM / eSIM—eSIM
NFC—Yes
Ultra Wideband (UWB)—Ultra Wideband (UWB) support (gen2 chip)
Satellite features—Emergency SOS via satellite

Identity & design

Identity & design specifications comparison
SpecificationAmazfit T-Rex Ultra 2Apple Watch Ultra 4 49mm
BrandAmazfitApple
ModelAmazfit T-Rex Ultra 2Apple Watch Ultra 4 49mm
Dimensions51 × 51 × 14.3 mm, excluding heart-rate sensor base49 x 44 x 12 mm (1.93 x 1.73 x 0.47 in)
Weight89.2 g with strapNatural titanium: 63.0 g; black titanium: 63.1 g
Build materialsFibre-reinforced polymer case; Grade 5 titanium bezel, buttons and back panelGrade 5 titanium case; sapphire crystal front; ceramic and sapphire crystal back
Wrist size145–215 mm130–210 mm
Strap / band26 mm silicone strap with classic pin buckleIncluded band; style depends on the selected configuration
Controls / buttonsFour physical buttons; sapphire-glass touchscreenCustomizable Action button; Digital Crown with haptic feedback; side button; single tap, double tap and wrist flick gestures
Announced—2026, September 09

Performance & software

Performance & software specifications comparison
SpecificationAmazfit T-Rex Ultra 2Apple Watch Ultra 4 49mm
Storage64 GB total; 26.7 GB available64GB
Processor—Apple S11
CPU—Dual-core
GPU—PowerVR
Operating system—watchOS 27

Audio & communication

Audio & communication specifications comparison
SpecificationAmazfit T-Rex Ultra 2Apple Watch Ultra 4 49mm
SpeakerSupportedDual speakers; media playback; siren
MicrophoneSupportedThree-microphone array with beamforming and wind-noise mitigation
CallingBluetooth calling and call/text notifications through a connected smartphoneCellular and Bluetooth calling; international emergency calling

Sensors, health & fitness

Sensors, health & fitness specifications comparison
SpecificationAmazfit T-Rex Ultra 2Apple Watch Ultra 4 49mm
SensorsBioTracker 6.0 PPG biometric sensor (5 photodiodes + 2 LEDs); accelerometer; gyroscope; geomagnetic sensor; barometric altimeter; ambient-light sensor; temperature sensorElectrical heart sensor; always-on optical heart sensor; blood oxygen sensor; temperature sensor; depth gauge; water-temperature sensor; compass; always-on altimeter; high-g accelerometer; high dynamic-range gyroscope; ambient-light sensor
Health & wellness features24-hour heart-rate, blood-oxygen, stress and skin-temperature monitoring; one-tap measurement; HybridCharge, BioCharge and LifeLoad energy insights; VO₂ Max and health alertsHeart rate; HRV; blood oxygen; ECG; wrist temperature; respiratory rate; Readiness; Vitals; cycle tracking; high/low heart-rate, irregular rhythm and hypertension notifications (regional availability)
Sleep trackingSleep HRV; sleep quality; stages including REM; daytime naps; sleep schedule; breathing quality; sleep score; RestoreIQ recovery insightsSleep duration; sleep stages; sleep score; sleep-apnea notifications (regional availability)
Sports / workout modes187 sports modes; smart recognition of 25 strength-training movements and 8 sports movements; HYROX race and training modesRunning; hiking; cycling; pool and open-water swimming; skiing; snowboarding; rowing; paddling; golf; walking; HIIT; yoga; strength; dance; Pilates; Tai Chi; kickboxing; multisport and more
Training & outdoor featuresZepp 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 sensorsCustom workouts and views; Training Load and Workout Effort; heart-rate zones; VO₂ max; Race Route; Pacer; running dynamics; automatic track detection; offline maps, routes, waypoints, Backtrack and elevation alerts
Safety & emergency featuresTwo-colour flashlight with SOS/Boost modes; storm, high-altitude blood-oxygen and route-deviation alertsEmergency SOS; satellite SOS and messaging; international emergency calling; siren; flashlight; Fall Detection; Crash Detection; Check In; noise monitoring; emergency waypoints
Diving / depth featuresFreediving and recreational scuba-diving support to 45 m; EN13319:2000, ISO 6425:2018 and GB/T 18828-2022 diving certifications; Bühlmann ZHL-16C decompression modelRecreational scuba diving to 40 m; automatic dive launch at 1 m; current/maximum depth and duration; GPS entry/exit points; depth gauge and water temperature

Battery & durability

Battery & durability specifications comparison
SpecificationAmazfit T-Rex Ultra 2Apple Watch Ultra 4 49mm
Battery capacity870 mAh ratedLi-Ion 631 mAh
Battery lifeTypical 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 hUp to 50 hours normal use; 84 hours Low Power Mode; 18 hours workout tracking; 25 hours Extended Workout; 45 hours Max Extended Workout
ChargingMagnetic charging head; DC 5 V 1.5 A maximum inputMagnetic fast charging; up to 80% in about 45 minutes
Water resistance10 ATM; tested to ISO 22810:2010100 m under ISO 22810:2010; suitable for swimming, snorkeling, scuba and high-speed water sports
Durability / certificationsMIL-STD-810H-2019; low-temperature operation down to −30 °C; SGS water-resistance test; certified diving standardsIP6X dust resistance under IEC 60529; EN 13319 recreational diving to 40 m; tested to MIL‑STD‑810H

Compatibility

Compatibility specifications comparison
SpecificationAmazfit T-Rex Ultra 2Apple Watch Ultra 4 49mm
Phone compatibilityAndroid 7.0 or later; iOS 15.0 or lateriPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or later
Companion appZepp AppApple Watch app on iPhone
ColorsBlack MagmaNatural, Black

Additional specifications

Additional specifications specifications comparison
SpecificationAmazfit T-Rex Ultra 2Apple Watch Ultra 4 49mm
Case material—Grade 5 titanium
Military-grade resistance—MIL-STD-810H
Flashlight—Supported
Display material—LTPO3 wide-angle OLED
Pixels per inch—326 ppi
Peak brightness—Up to 3,000 nits peak; 1 nit minimum
Cover / touchscreen—Supported
Charging time—About 45 minutes to 80%; 15 minutes for up to 18 hours normal use; 5 minutes for up to 10 hours sleep tracking
Packing list—Apple Watch Ultra 4; band; 1 m magnetic fast-charger to USB-C cable
Release status—Available. Released 2026, September 18
Model numbers—A3579
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, 17, 18, 19, 20, 25, 26, 28, 38, 39, 40, 41, 53, 66, 71
5G bands—1, 2, 3, 5, 7, 8, 12, 14, 20, 25, 26, 28, 38, 40, 41, 53, 66, 71 SA/NSA
Network speed—HSPA, LTE, 5G
Additional hardware features—Health Sensing System: third‑generation electrical heart sensor, always‑on optical heart sensor, blood oxygen sensor, temperature sensor; Temperature sensing (0.01˚ accuracy); Depth gauge (±1m accuracy)

Similarities

  • Both support Wi-Fi 4.
  • Both work with a companion app.
  • Both take calls over Bluetooth.
  • Both give daily scores (Recovery, BioCharge, Readiness).
  • Both have OLED displays.
  • Both offer up to 64 GB of storage.

In summary

Get the Amazfit T-Rex Ultra 2 if you want much longer battery life and a choice of Android phone or iPhone, or the Apple Watch Ultra 4 49mm if you would rather have ECG heart-rhythm readings and a lighter watch for all-day wear.

Back to compared products ↑

In-stock alternatives

Apple Watch UltraFor Amazfit T-Rex Ultra 2Apple Watch UltraView product ↗Apple Watch Ultra 3For Amazfit T-Rex Ultra 2Apple Watch Ultra 3View product ↗Apple Watch Ultra 2For Apple Watch Ultra 4 49mmApple Watch Ultra 2View product ↗Apple Watch Series 11For Apple Watch Ultra 4 49mmApple Watch Series 11View product ↗

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