Amazfit Active 3 Premium vs Amazfit T-Rex 3 Pro: which should you buy?
Get the Amazfit Active 3 Premium. It is the better watch for running, heart rate and sleep, and it is the better buy today: we would wait on the Amazfit T-Rex 3 Pro for a better price. The T-Rex is the tougher watch, but most people do not need what it adds.
Who should get the Amazfit Active 3 Premium
Get the Active 3 Premium if you want a light everyday watch that takes running seriously. Amazfit gives it built-in running workouts, coached plans from a 5K to a marathon, and running power, plus heart rate, blood oxygen, skin temperature and sleep tracking with no subscription. It also carries free offline maps with turn-by-turn directions. On an iPhone it works with limits, so some features that need deeper phone access stay on Android.
Who should get the Amazfit T-Rex 3 Pro
Get the T-Rex 3 Pro if you dive or disappear for weeks. Amazfit certifies it for diving to 45 meters and lists up to 25 days of typical battery on the larger size. It works with an iPhone and with an Android phone. Our page reads wait on it today, so check its price before you pay.
The differences that matter
Water is the clear split. The T-Rex 3 Pro is rated 10 ATM and certified for diving, while the Active 3 Premium is for swimming and showers.
Battery also favors the T-Rex, which lasts weeks. The Active 3 Premium lasts days, which is fine for most people who charge once a week.
Price and value
Today the Amazfit Active 3 Premium costs $169.99 (checked Nov. 4, 2026) and the Amazfit T-Rex 3 Pro costs $399.99 (checked Nov. 4, 2026). The Amazfit Active 3 Premium is cheaper by $230.
For everyday training, pick the Amazfit Active 3 Premium.
Amazfit Active 3 Premium vs Amazfit T-Rex 3 Pro
Amazfit Active 3 Premium
$169.99 at Amazfit
Amazfit T-Rex 3 Pro
$399.99 at Amazon- Amazfit Active 3 Premium: 5 ATMWater resistanceBetter â–¸Amazfit T-Rex 3 Pro: 10 ATM
- Amazfit Active 3 Premium: 1.32-inch AMOLED, 466 x 466, up to 3,000 nits, sapphire glassDisplayAmazfit T-Rex 3 Pro: 1.5 in AMOLED (48mm) or 1.32 in AMOLED (44mm), up to 3,000 nits, sapphire glass
- Amazfit Active 3 Premium: Up to 12 days with typical use, up to 7 days with heavy use; up to 24 hours of continuous GPSBatteryAmazfit T-Rex 3 Pro: Typical use: up to 25 days (48mm), 17 days (44mm); accurate GPS: up to 38 hrs (48mm), 26 hrs (44mm)
- Amazfit Active 3 Premium: 38g without the strapWeightAmazfit T-Rex 3 Pro: 52g (48mm) or 46.8g (44mm), without strap