Amazfit T-Rex 3

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Overall

#38 in

Fitness Trackers

according to Reddit Icon Reddit

Sentiment score83% positive
54
2
9

Top Pros

Top Cons

Last updated: May 7, 2026

Reddit Reviews

Reddit IconAevernum
6 months ago

The sensors suit me. It detects sleep well. It gives advice on recovery. The watch worked in auto mode for about 10 days, 57% remained. I can't compare it with the Pro version, I haven't used the Pro version.

6 months ago

Hello dear. I decided to buy myself a watch for Black Friday. I love traveling outside the city, tinkering, and I'm also a military man. I plunged into the black hole of searching for a personal watch and fell into depression. I read a bunch of reviews on Garmin, Coros, Amazfit and got confused. Would you be so kind to tell me about your personal durable watches that have lasted a very long time, have a large battery life, have excellent sensors for tracking vital functions of the body, and of course, good synchronization with the phone. Such that will withstand swimming in a river, pool, winter trips for several hours. IDK how many papers i want to spend on it, maybe up to $300, used market also fine. I had a Kospet Tank M3 Ultra, but i dont like that software. \[UPD\] Got Amazfit T-REX 3. A great watch, lots of customization, lots of features, not heavy, fairly protected, comes with adapters for 22mm third-party straps. The 3.81cm (1.5") diagonal creates a somewhat bulky look and at the same time is not too small. For my 19cm wrist (girth) it is a great size ratio. The application on the phone is quite clear, you can figure it out quickly. There is a whole portal and knowledge base for creating your own skins.

6 months ago

I tried to compare the new T-REX 3 with a second-hand Garmin Fenix ​​6X in excellent condition. But somehow unusual. The T-Rex 3 is too new. Before that, I had a Tank M3 Ultra, I didn’t like the app for the phone, there was quite a bit of customization, you can’t make a skin yourself, you can only set a picture as a background. The watch itself gives the impression of a solid, solid device for extreme conditions. There are enough functions. But somehow it’s not that, the soul doesn’t feel full)) Before Tank, I had a Suunto Core, it was a simple ABC watch that was perfect for me until I lost it ( Now I really want something personal, something that will be with me for a long time, and will even have those functions that I don’t even know about.

Reddit IconApprehensivePizza964
5 months ago

The watch so many people have no idea exists, is the Amazfit T-Rex 2 or 3. I prefer the 2 as the size is perfect but the 3 is larger. These watches can do it all and have a battery life on a single charge of 27-30 days. Yes, it tracks your health, phone calls and messages etc. You name it, it can do it. I was dead set on Garmins top watch and stumbled on the Trex at Best buy by accident. Saw it was a couple hundred bucks and can't find anything like it for the price. Link, https://us.amazfit.com/products/amazfit-t-rex-3?srsltid=AfmBOop_QFFZAqxYEbadiSkjE18Be4yPUUNQ1yQYy1i70QuodQiDMxmI

Reddit IconAriquitaun
2 months ago

The t-rex 3 is excellent as a fitness and health tracker with a very accurate heart rate sensor. It does not have ecg.

6 months ago

Amazfit Balance 2 should be about that price. The T-Rex 3 as well for something more sporty. The T-Rex 3 pro is out of that price range, but it's worth the extra. Or Bip 6, or Active 2 round or square, for a cheaper option with the same sensors and 90% of the features and limited local storage. The current gen of Amazfit devices are really very good.

10 days ago

All current-generation Amazfit devices share the same heart rate sensor. The larger and heavier the device, the worse its performance. Personally, I find my T-Rex 3 Pro quite accurate, even during weightlifting, compared to my Polar H10, but only when worn higher up and a bit tighter than usual. Conversely, the Ultra 2 is reportedly hit or miss. The GPS on it is excellent. My neighbourhood is full of high rises and city canyons and the wobble is minimal. I normally have it on auto.

Reddit Iconavirup_231
7 months ago

"Honestly there are SO many expensive options out there that do NOTHING, go for mid tier options like these 2 since stuff like this strikes a balance between price and features. 1) [The Amazfit one](https://quancoconline.com/dp-B0DHZDCF6WI) this one’s my top pick if you want REALLY GOOD battery life (27+ days), reliable fitness tracking, proper waterproofing, offline maps, and even AI voice control. Like, it does everything you actually need without turning into a second phone but it does not have google play store or third-party apps so if you’re into installing spotify or messaging apps on your watch, this ain’t it. 2) Galaxy watch6 is sleek, very smooth if you’re on a samsung phone, and probably the best looking out of the bunch. The fitness tracking’s good, and notifications are seamless but battery life isn’t great usually around 1–1.5 days tops, so you’ll need to charge it almost daily."

Reddit IconBeYeCursed100Fold
12 months ago

I love Amazfit. I have the T-Rex and T-Rex 3, the 3 gets about 14-18 days of battery even with GPS on.

12 months ago

I love Amazfit. I have the T-Rex and T-Rex 3, the 3 gets about 14-18 days of battery even with GPS on.

Reddit IconBlastTyrantKM
3 months ago

Just about any fitness watch will do a decent job of that. I just got an Amazfit T-Rex 3 and it's really nice. Very good battery life, all the body metrics you can imagine, very accurate GPS, and just about all the smartwatch features you could hope for. It just doesn't have the seamless integration that an Apple watch has with iPhone or a Galaxy Watch has with Samsung.

6 months ago

Personally, I found maps on a watch mostly useless. I've had a Garmin Fenix 5x and I currently have an Amazfit T-Rex 3. The screen is too small to see any real details. I had to constantly zoom in to see any details that were near, then zoom back out so I could see just a little bit further ahead. Eventually, I fully gave up with the watch maps. It's MUCH easier to just use your phone for map navigation. Plus here's something to consider...if you have a fast charging power bank, a phone will charge *MUCH* faster than a watch. Not to mention, this time of year your watch is probably covered by at least one sleeve and maybe the cuff of a glove, too. Which makes it much more cumbersome to use for anything, let alone navigation Edit: I'm not saying you can't navigate with it. You can. But it's not "just glance at my watch to see where I'm going". It's not that. You have to stop and fiddle with it, and fiddle with it, and fiddle with it

Reddit IconChasingPotatoes17
10 months ago

How small? Mine is 5.9” and I wear a T-Rex 3 and Balance 2. Yes they are large on my wrist but I love a chunky watch. Of the two, Balance 2 is definitely better for less movement on wrist during a workout (which translates to more reliable HRM data).

10 months ago

I tend to wear my watches about 3 finger width behind my wrist bone. With the TRex 3’s default strap on the tightest hole that’s mostly okay but I do use an external HRM during workouts. If I swap in a different strap (similar in style to the Apple sport band with all the holes in it) I can get the device pretty securely in place and have no issues. With the Balance 2 (using the red strap, I haven’t tried the black one) I have zero issues. If either watch were *any* bigger it would be a problem though. They do look massive on my arm, but I like that style. If you’re not sure, the slightly smaller Active 2 might be a safer bet. Feature and sensor wise it’s almost the same. It doesn’t have multi-band GPS, but neither does my Apple Watch 10 and it doesn’t great with GPS accuracy. Sometimes the specs aren’t the whole story.

Reddit Icondesko1973
3 months ago

I switched from Venu 2 to Amazfit Rex3 and I don't regret it

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