Amazfit Stratos 3 vs Amazfit T-Rex ProSize, Specs & Wrist Fit Compared
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Amazfit
Stratos 3
Amazfit
T-Rex Pro
Which one fits you
Both need much the same wrist — roughly 50–69mm across the flat of the wrist. Neither will fit where the other won't, so decide on thickness, weight and features instead.
The Amazfit Stratos 3 wears larger than the Amazfit T-Rex Pro (48.6mm vs 47.7mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
On the wrist the Amazfit Stratos 3 feels lighter (40.4g vs 59.4g, case only).
The Amazfit Stratos 3 is middle-of-the-pack for thickness among the 26 49mm watches in the database.
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 | AmazfitStratos 3 | AmazfitT-Rex Pro |
|---|---|---|
| Case Width | 48.6mm | 47.7mm |
| Thickness | 13.4mm | 13.5mm |
| Weight | 40.4g | 59.4g |
| Shape | Circular | Circular |
| Water Resistance | 5 ATM | 10 ATM |
| GPS | 70 hours | 40 hours |
| Display | 1.34 inches | 1.3 inches |
| Always-On Display | Yes | Yes |
| Charge time | 2.5 hours | 1.5 hours |
| Battery life | 7 days | 18 days |
| Battery power | 300 mAh | 390 mAh |
| Has wireless charging | No | Yes |
| Has a removable battery | No | No |
| Battery life with GPS on | 70 hours | 40 hours |
| Has a solar power battery | No | No |
| Has a rechargeable battery | Yes | Yes |
| Battery life in power save mode | 336 hours | — |
| 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 2.6× as long as the other (18 days against 7 days).
Amazfit Stratos 3Amazfit T-Rex Pro
Smartwatch
7 days18 daysBattery Saver
336 hours—GPS
70 hours40 hours
Full Specification Comparison
122 specs| Spec | Amazfit Stratos 3 | Amazfit T-Rex Pro |
|---|---|---|
| Design | ||
| width | 48.6 | 47.7 |
| height | 48.6 | 47.7 |
| volume | 31.65 cm³ | 30.72 cm³ |
| weight | 40.4 g | 59.4 g |
| thickness | 13.4 | 13.5 |
| ATM rating | 5 ATM | 10 ATM |
| resolution | 320 x 320 px | 360 x 360 px |
| screen size | 1.34 inches | 1.3 inches |
| Display type | LCD | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 338 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 | 2.5 hours | 1.5 hours |
| battery life | 7 days | 18 days |
| battery power | 300 mAh | 390 mAh |
| has wireless charging | No | Yes |
| has a removable battery | No | No |
| battery life with GPS on | 70 hours | 40 hours |
| Has a solar power battery | No | No |
| has a rechargeable battery | Yes | Yes |
| battery life in power save mode | 336 hours | — |
| 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 | ||
| RAM | 0.5GB | — |
| CPU speed | 2 x 1.2 GHz | — |
| release date | 2019-08-27 | 2021-03-27 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| Has call control | Yes | Yes |
| Has silent alarm | Yes | Yes |
| internal storage | 4GB | — |
| measures VO2 max | Yes | 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 |
| Can be used to answer calls | No | No |
| has irregular heart rate warnings | No | Yes |
| Has a built-in camera remote control function | No | No |
| warranty period | — | 1 years |
| has HRV tracking | — | Yes |
| shows readiness level | — | Yes |
| measures resting heart rate | — | Yes |
| has fast/slow heart rate notifications | — | Yes |
| Connectivity | ||
| has NFC | No | No |
| Wi-Fi version | Wi-Fi 4 (802.11n) | — |
| supports ANT+ | No | No |
| supports Wi-Fi | Yes | No |
| supports Galileo | Yes | Yes |
| Bluetooth version | 4.2 | 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 |
| Can upload maps | Yes | — |
| maximum Bluetooth range | 10 m | — |
| Is compatible with Windows | No | No |
| Is compatible with Mac OS X | No | No |
| has an external memory slot | No | No |
| Compatible with smart scales | Yes | Yes |
| 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 |
| 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 | Yes | 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 Stratos 3
Sits best on wrists ~51–69mm wide (≈ 13.6–18.4cm 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 Stratos 3 bigger than the Amazfit T-Rex Pro?
The Amazfit Stratos 3 is bigger — 48.6mm vs 47.7mm case width.
Which fits a smaller wrist better, the Amazfit Stratos 3 or the Amazfit T-Rex Pro?
The Amazfit Stratos 3 suits wrists around 51–69mm 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 Stratos 3 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.