Device summary

Amazfit

Amazfit T-Rex Ultra

Polar

Vantage V3

Full specifications

Full specifications
Basic information
Release year20232023
Starting price—$650
Display size1.4-inch1.4-inch
Dimensions47.3 mm × 47.3 mm × 13.4 mm47.3 mm × 47.3 mm × 13.5 mm
Weight89 g39 g
Front materialGlassGorilla Glass
Back material—Aerospace aluminium
Display
Display technologyAMOLEDAMOLED
Resolution454 × 454454 × 454
Peak brightness1000 nits—
Protection—Gorilla Glass
Performance
Expandable storageNoNo
Storage—32 GB
Battery & charging
Charging standardMagnetic chargingProprietary / USB-C. Smartwatch mode up to 10 days; performance training (GPS + HR) up to 43 h; eco training up to 140 h (power-save — not everyday life). Complete watch 57 g with wristband; body 39 g without
Battery typeLithium-ionLi-Pol (488 mAh)
Rated capacity500 mAh—
Connectivity
CellularDual-band GPS / multi-GNSSGPS / GLONASS / Galileo / BeiDou / QZSS (dual-frequency), Offline full-color maps and route guidance, Polar Elixir™ (ECG GEN 1, SpO2 GEN 1, skin temp GEN 1, OHR GEN 4), Barometer; magnetometer compass; ambient light sensor, Polar Flow
Wi‑FiWi-Fi 2.4 GHz—
BluetoothBluetoothBluetooth® LE
Build & durability
FramePolymer alloy middle frameAerospace aluminium case and bezel
Ingress protection10 ATMWR50 (50 m)

Key differences

The most meaningful measured gaps in size and weight — not an overall winner.

  • Weight

    Vantage V3

    50 g lighter

  • Height

    Very similar height

  • Width

    Very similar width

  • Thickness

    Very similar thickness

What these size differences mean

Calculated from the dimensions shown, rounded to 0.1 mm and 1 g. Percentages use the smaller measurement as the reference. Fold and rotation settings affect the dimensions compared.

  • Both have the same listed width (47.3 mm) at the displayed precision. Check this difference against the width of your current device and pocket opening.
  • Both have the same listed height (47.3 mm) at the displayed precision. This describes the body outline; screen diagonal alone does not tell you the overall size.
  • Vantage V3 is 0.1 mm (0.7% relative to Amazfit T-Rex Ultra) thicker. Cases and camera protrusions can change the clearance you need.
  • Vantage V3 is 50 g lighter. This is the listed device-weight difference, not a measured comfort rating.

Use these figures to compare physical size. They do not establish one-handed reach, pocket fit, durability or an overall winner.

Sources and measurement notes

Sizometry compares published specifications and calculates differences. These are not hands-on measurements or tests of comfort, performance or pocket fit.

Check the exact model, year, region and configuration on the linked page. References may cover several variants. Folded and unfolded dimensions differ; cases and camera protrusions may change the space a device needs. Drawings share a relative scale and are not calibrated to life size on your screen.

Amazfit T-Rex Ultra vs Vantage V3 Size Comparison