Amazfit GTR vs Amazfit T-Rex ProSize, Specs & Wrist Fit Compared
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Amazfit
GTR
Amazfit
T-Rex Pro
Which one fits you
Both need much the same wrist — roughly 50–68mm across the flat of the wrist. Neither will fit where the other won't, so decide on thickness, weight and features instead.
The Amazfit T-Rex Pro wears larger than the Amazfit GTR (47.7mm vs 47.2mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Amazfit GTR is the slimmer of the two (10.75mm vs 13.5mm), so it slides under a cuff more easily.
On the wrist the Amazfit GTR feels lighter (48g vs 59.4g, case only).
Among the 87 47mm watches we hold thickness for, the Amazfit GTR is thinner than 99%, so it wears flatter than its width suggests.
Among the 52 48mm watches we hold thickness for, the Amazfit T-Rex Pro is thinner than 69%, so it wears flatter than its width suggests.
Specification Comparison
| Spec | AmazfitGTR | AmazfitT-Rex Pro |
|---|---|---|
| Case Width | 47.2mm | 47.7mm |
| Thickness | 10.75mm | 13.5mm |
| Weight | 48g | 59.4g |
| Shape | Circular | Circular |
| Water Resistance | 5 ATM | 10 ATM |
| GPS | 40 hours | 40 hours |
| Display | 1.39 inches | 1.3 inches |
| Always-On Display | Yes | Yes |
| Charge time | 2 hours | 1.5 hours |
| Battery life | 12 days | 18 days |
| Battery power | 410 mAh | 390 mAh |
| Has wireless charging | Yes | Yes |
| Has a removable battery | No | No |
| Battery life with GPS on | 40 hours | 40 hours |
| Has a solar power battery | No | No |
| Has a rechargeable battery | Yes | Yes |
| Has a battery level indicator | Yes | Yes |
| Released | 2019 | 2021 |
Battery life compared
The two are closest in everyday use and furthest apart in Smartwatch mode, where one lasts 1.5× as long as the other (18 days against 12 days).
Amazfit GTRAmazfit T-Rex Pro
Smartwatch
12 days18 daysGPS
40 hours40 hours
Full Specification Comparison
115 specs| Spec | Amazfit GTR | Amazfit T-Rex Pro |
|---|---|---|
| Design | ||
| width | 47.2 | 47.7 |
| height | 47.2 | 47.7 |
| volume | 23.95 cm³ | 30.72 cm³ |
| weight | 48 g | 59.4 g |
| thickness | 10.75 | 13.5 |
| ATM rating | 5 ATM | 10 ATM |
| resolution | 454 x 454 px | 360 x 360 px |
| screen size | 1.39 inches | 1.3 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 326 ppi | 391.6 ppi |
| width of band | 22 mm | 22 mm |
| water resistance | Waterproof | Waterproof |
| Always-On Display | Yes | Yes |
| has a touch screen | Yes | Yes |
| Gorilla Glass version | Gorilla Glass 3 | Gorilla Glass 3 |
| waterproof depth rating | 50 m | 100 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | No |
| has branded damage-resistant glass | Yes | No |
| maximum operating temperature | — | 70 °C |
| lowest potential operating temperature | — | -40 °C |
| Battery | ||
| charge time | 2 hours | 1.5 hours |
| battery life | 12 days | 18 days |
| battery power | 410 mAh | 390 mAh |
| has wireless charging | Yes | Yes |
| has a removable battery | No | No |
| battery life with GPS on | 40 hours | 40 hours |
| Has a solar power battery | No | No |
| has a rechargeable battery | Yes | Yes |
| Sensors | ||
| has GPS | Yes | Yes |
| has a compass | Yes | Yes |
| Has a barometer | Yes | Yes |
| has a gyroscope | Yes | Yes |
| Has a cadence sensor | No | No |
| has an accelerometer | Yes | Yes |
| Monitors perspiration | No | No |
| Has a heart rate monitor | Yes | Yes |
| Has a temperature sensor | No | No |
| Monitors blood oxygenation levels | No | Yes |
| Features | ||
| release date | 2019-07-16 | 2021-03-27 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| Has call control | Yes | Yes |
| Has silent alarm | Yes | Yes |
| has HRV tracking | No | Yes |
| measures VO2 max | No | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | No | No |
| Locates your phone | Yes | Yes |
| has a front camera | No | No |
| has fall detection | No | No |
| has voice commands | No | No |
| Acquires GPS faster | No | Yes |
| Has vibrating alerts | Yes | Yes |
| shows readiness level | No | Yes |
| Can be used to answer calls | No | No |
| measures resting heart rate | Yes | Yes |
| has irregular heart rate warnings | No | Yes |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | No | No |
| warranty period | — | 1 years |
| Connectivity | ||
| has NFC | No | No |
| supports ANT+ | No | No |
| supports Wi-Fi | No | No |
| supports Galileo | No | Yes |
| Bluetooth version | 5 | 5 |
| has a cellular module | No | No |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| Miscellaneous | ||
| has aptX | No | No |
| Has passcode | Yes | Yes |
| Is compatible with Windows | No | No |
| Is compatible with Mac OS X | No | No |
| has an external memory slot | No | No |
| has a battery level indicator | Yes | Yes |
| has a socket for a 3.5 mm audio jack | No | No |
| Compatible with external heart rate monitors | Yes | Yes |
| Has auto pause | — | Yes |
| Compatible with smart scales | — | Yes |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Tracks BMI | Yes | Yes |
| Supports routes | Yes | Yes |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has exercise diary | Yes | Yes |
| Can be personalised | Yes | Yes |
| Has weight tracking | No | Yes |
| Predicts start date | Yes | Yes |
| Tracks water intake | No | Yes |
| Has inactivity alerts | Yes | Yes |
| Has period notifications | Yes | Yes |
| Has temperature tracking | No | No |
| Provides activity reports | Yes | Yes |
| Counts how many calories you've burned | Yes | Yes |
| Has coaching | — | Yes |
| Includes maps | — | Yes |
| Has live tracking | — | Yes |
| Predicts ovulation | — | Yes |
| Displays fertile window notifications | — | Yes |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | Yes |
| Tracks elevation | Yes | Yes |
| Designed for golf | No | No |
| Tracks your sleep | Yes | Yes |
| Tracks steps taken | Yes | Yes |
| Designed for diving | No | No |
| Has a route tracker | No | No |
| Has exercise tagging | Yes | Yes |
| Has multi-sport mode | Yes | Yes |
| Tracks calorie intake | No | Yes |
| Provides sleep reports | Yes | Yes |
| Detects activities automatically | Yes | Yes |
| Has a stroke counter for swimming | Yes | Yes |
Wrist Fit
Amazfit GTR
Sits best on wrists ~50–67mm wide (≈ 13.4–17.9cm circumference).
Amazfit T-Rex Pro
Sits best on wrists ~50–68mm wide (≈ 13.4–18.2cm circumference).
2D Dimension Schematics
Accurate scale drawings based on case dimensions. Drag to pan, Ctrl+scroll to zoom. Works for every watch regardless of photo availability.
Frequently Asked Questions
Is the Amazfit GTR bigger than the Amazfit T-Rex Pro?
The Amazfit T-Rex Pro is bigger — 47.7mm vs 47.2mm case width.
Which fits a smaller wrist better, the Amazfit GTR or the Amazfit T-Rex Pro?
The Amazfit GTR suits wrists around 50–67mm wide, and the Amazfit T-Rex Pro around 50–68mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Amazfit GTR and Amazfit T-Rex Pro side by side at true scale?
Yes — the schematics and photos above show both watches at matched scale, and our fit tool overlays each on your wrist width.