Reviews Amazfit T-Rex 3 Onyx
Interested in reviews of Amazfit T-Rex 3 Onyx? It got 4.9 out of 5 stars from our customers. Find specific customer reviews of Amazfit T-Rex 3 Onyx below. We will appreciate if you also share your experiences with Amazfit T-Rex 3 Onyx after purchasing.
User Reviews
Ondřej, Praha
Rated 19/06/2026, variant Amazfit T-Rex 3 Onyx
Verified purchase
Great price/performance ratio. a superb watch
agile system
Metrics
durability
robust construction
super batteries
Perhaps just payments via Curve, but it’s a sports watch, so it doesn’t really matter
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Martin, Stochov, Honice
Rated 01/06/2026, variant Amazfit T-Rex 3 Onyx
Verified purchase
I've had 2s, now I'm going for a 3. The technological shift is significant, the metrics are much, much more accurate. I replaced the belt immediately, I'm used to the application, but some things still annoy me.
Significantly better than its predecessor
They finally made it possible to download more apps
Much more accurate metrics
I like
Battery life very good even with active use
I changed the strap straight away for another one, the silicone (or whatever it is) doesn't suit me
The app has been "tweaked" a few times and not all changes were welcomed by me
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Lukáš, Luby u Chebu
Rated 11/02/2026, variant Amazfit T-Rex 3 Onyx
Verified purchase
meet expectations
they work absolutely great
all notifications work without problems and with accuracy
does not need to be within range of the phone to record and save activity
my mistake for not reading that it doesn't have a genre glass
soon scratched
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Marek, Ostrava
Rated 03/02/2026, variant Amazfit T-Rex 3 Onyx
Verified purchase
Battery life
Impact resistance
NOTHING
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Radek, Praha 10
Rated 11/01/2026, variant Amazfit T-Rex 3 Onyx
Verified purchase
satisfaction quick assembly and pleasant on the hand.
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David, Praha 6
Rated 06/01/2026, variant Amazfit T-Rex 3 Onyx
Verified purchase
long battery life
quality workmanship
many useful features
GPS accuracy
strap change only with a special screwdriver
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Stanislav, Kozárovice
Rated 05/01/2026, variant Amazfit T-Rex 3 Onyx
Verified purchase - review from a price comparison website
long battery life
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Miroslav, Usti nad Labem
Rated 05/01/2026, variant Amazfit T-Rex 3 Onyx
Verified purchase
design
Sleep! since I have these, I don't actually sleep according to them!
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Jiří, Klášterec nad Ohří 1
Rated 04/12/2025, variant Amazfit T-Rex 3 Onyx
Verified purchase
I would recommend the watch to more technically savvy people who want to work on their fitness. In a week of fairly intensive research, I've sort of adapted them to my needs and tried most of the options except for activity planning, routes and the ZEPP trainer. They won't be ideal for people with a passive lifestyle or those new to fitness watches and bracelets. I bought these after 4 years of experience with the Garmin Instinct Solar and will compare them a bit further:
T-Rex 3 are not as stingy with stats without a mobile app as Garmin. You only need the app for a few things, like updating software, adding dials and apps, uploading music, maps, routes and training plans, evaluating more challenging parameters, or taking interactive readings from graphs. And to control the phone. A less demanding user can therefore do without a phone for a month. But then maybe he doesn't need a T-Rex. The watch dutifully drives the user to greater performance and fitness, which can be annoying and I failed to suppress everything. I prefer information requested. That's where the Garmin suited me.
An interesting match was found in the measurement of heart rate at low temperature. Both the Garmin and the T-Rex will reduce the heart rate reading by 1/3 or 1/2 when they are off the sleeve. As soon as I hide them in the heat, the heart rate soon jumps to the real value (see screenshot after the middle of the graph - from 80 to 119 in 2s). Could it be chips from the same manufacturer from the same defective series? But four years apart? Most of the characteristics evaluated depend on the heart rate measurement!
The T-Rex calibrates its height when you start any outdoor activity you start. He can do it in a flash, even on a housing estate. But when calibrating the altitude by GPS from the menu, it counts down 5 minutes and when I was in a mountain meadow about 50 m from the forest, the calibration failed. I had to move on. Garmin had it in seconds and calculated 10 meters higher.
Music playback works for both music on your watch and your mobile phone. However, the watch contains songs in one package without distinguishing artist, album or genre. I haven't found a way to remove them from the watch. Maybe a factory reset, but you probably don't want that. I sent a query directly from ZEPP APP, but have not yet received a reply. As the number of songs increases, I would cringe at skipping what I don't want to listen to. In addition, only MP3 music can be uploaded here. WMA or OGG is not supported. It handles music on my phone without any problems. You can select songs on your mobile (playlist, album, whatever). The watch can start, pause, skip forward and backward, show the name of the song and adjust the volume. Fine for cleaning, but running around with your cell phone for music?
Interestingly, the T-Rex 3 also detects outdoor activity (e.g. walking) automatically record the route and altitude profile, as if they were using satellite navigation. But that would dramatically reduce battery life. When I walked to the entrance, the map showed the kind of clique that GPS typically draws in the woods with poor satellite visibility. In addition to GPS, Galileo and Glonass (like Garmin), they can also do BDS and even in smart mode, where they combine several systems (what can be seen from the forest) when there are no satellites in sight. In open terrain, it saves battery by turning off redundant receivers.
Otherwise, T-Rex 3 is a varied source of fun for the playful and a solid tool on the road to better fitness. In the offered watch apps I found among others. a simple and useful app for monitoring your drinking habits. For older reviews click here: Activities can also be stopped, not just paused - you'll find the button directly below the Pause button. Perhaps some recent updates have made this possible. The latest one, which I downloaded yesterday, already allows you to adjust the font size and take a screenshot by pressing two buttons. In short, what the lizard can't do today, they will do tomorrow. And don't be afraid to investigate. The manual on the website doesn't even tell you 10% of what the watch can do.
Rich range of functions and measurement data
Extensive options for customising menus and reports
Leading an active, healthier lifestyle
Battery life (after a week of "torture" and curious exploration, there was still 27% left)
Varied selection of watch faces and additional apps (many free)
Measured data and calculated indicators are available directly in the watch with comments
With few exceptions, the ZEPP APP works on your mobile phone even without an internet connection
For outdoor activities, it will record the route and, if applicable, the number of people on the route. altitude profile even if you don't start the activity yourself
The heart rate measurement in cold environments is inaccurate (it measures 2/3 or 1/2 of the actual heart rate). In the warmth of the sleeve OK.
GPS altitude calibration takes 5 minutes and requires an unobstructed area or at least within a radius of about 50 m
Pop-up incentives or notifications that I don't care about, I have only partially suppressed
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Pavel, Karlovy Vary
Rated 24/11/2025, variant Amazfit T-Rex 3 Onyx
Verified purchase - review from a price comparison website
Shortly used so far
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