Amazfit T-Rex 3 vs COROS PACE 4 Pro: which should you buy?

Our pick

Get the COROS PACE 4 Pro

Winner for most people: COROS PACE 4 Pro. It is the better fit for running and workouts.

Winner: COROS PACE 4 Pro

Get the Amazfit T-Rex 3 only if you want to save $204.

Peak brightness

3,500 nits vs 2,000 nits

Dive rating

5 ATM (surface water, not diving) vs 10 ATM; certified for freediving to 147 ft (45 m)

$449COROS · Checked Nov. 1, 2026

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All the details

Key differences

Peak brightness: 2,000 nits vs 3,500 nitsAmazfit T-Rex 3: 2,000 nits (1.5 in AMOLED, 480 × 480, up to 2,000 nits, Gorilla Glass) ConfirmedSourceCOROS PACE 4 Pro: 3,500 nits ConfirmedSource
Water resistance: 10 ATM vs 5 ATMAmazfit T-Rex 3: 10 ATM (10 ATM; certified for freediving to 147 ft (45 m)) ConfirmedSourceCOROS PACE 4 Pro: 5 ATM (5 ATM (surface water, not diving)) ConfirmedSource

From each maker's own specifications. A point is listed only when both makers state a figure and the two differ; a point either maker does not state is left out, never guessed. Two figures measured under different conditions are shown side by side, not compared.

Who should buy which

The Amazfit T-Rex 3 Guide names it for outdoor adventure and hiking.Outdoor adventure: Military-grade build, freediving certification to 147 feet, and it shrugged off rocky Colorado mountain terrain. Source linkedSourceHiking: It logs up to 42 hours in accurate GPS mode during extended hiking trips. Source linkedSource
The COROS PACE 4 Pro Guide names it for running and travel.Running: Heart rate ran right in line with a chest strap on runs, and Effort Pace, a race predictor and Virtual Pacer plan your sessions. Source linkedSourceTravel: Pack it for a long trip: 60 hours of GPS and 21 days of daily use per charge. Source linkedSource