Amazfit GTR 3 vs Amazfit Zepp ZSize, Specs & Wrist Fit Compared
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Amazfit
GTR 3
Amazfit
Zepp Z
Which one fits you
Both need much the same wrist — roughly 48–66mm across the flat of the wrist. Neither will fit where the other won't, so decide on thickness, weight and features instead.
The Amazfit GTR 3 and Amazfit Zepp Z share a near-identical 45.8mm case, so wrist presence comes down to thickness, lug-to-lug and weight.
On the wrist the Amazfit GTR 3 feels lighter (32g vs 40g, case only).
Among the 212 46mm watches we hold thickness for, the Amazfit GTR 3 is thinner than 93%, so it wears flatter than its width suggests.
Among the 203 46mm watches we hold thickness for, the Amazfit Zepp Z is thinner than 97%, so it wears flatter than its width suggests.
Specification Comparison
| Spec | AmazfitGTR 3 | AmazfitZepp Z |
|---|---|---|
| Case Width | 45.8mm | 45.9mm |
| Thickness | 10.8mm | 10.7mm |
| Weight | 32g | 40g |
| Shape | Circular | Circular |
| Water Resistance | 5 ATM | Water resistant |
| GPS | 35 hours | Yes |
| Display | 1.39 inches | 1.39 inches |
| Always-On Display | Yes | Yes |
| Charge time | 2 hours | — |
| Battery life | 21 days | 15 days |
| Battery power | 450 mAh | 340 mAh |
| Has wireless charging | No | Yes |
| Has a removable battery | No | No |
| Battery life with GPS on | 35 hours | — |
| Has a solar power battery | No | No |
| Has a rechargeable battery | Yes | Yes |
| Battery life in training mode | 35 hours | — |
| Battery life in power save mode | 840 hours | — |
| Has a battery level indicator | Yes | Yes |
| Released | 2021 | 2020 |
Battery life compared
The two are closest in everyday use and furthest apart in Smartwatch mode, where one lasts 1.4× as long as the other (21 days against 15 days).
Amazfit GTR 3Amazfit Zepp Z
Battery Saver
840 hours—Smartwatch
21 days15 daysTraining
35 hours—GPS
35 hours—
Full Specification Comparison
116 specs| Spec | Amazfit GTR 3 | Amazfit Zepp Z |
|---|---|---|
| Design | ||
| width | 45.8 | 45.9 |
| height | 45.8 | 45.9 |
| volume | 22.65 cm³ | 22.54 cm³ |
| weight | 32 g | 40 g |
| thickness | 10.8 | 10.7 |
| ATM rating | 5 ATM | — |
| resolution | 454 x 454 px | 454 x 454 px |
| screen size | 1.39 inches | 1.39 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 326 ppi | 462 ppi |
| width of band | 22 mm | 22 mm |
| water resistance | Waterproof | Water resistant |
| Always-On Display | Yes | Yes |
| has a touch screen | Yes | Yes |
| waterproof depth rating | 50 m | — |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | No |
| has branded damage-resistant glass | No | Yes |
| Ingress Protection (IP) rating | — | IP68 |
| Battery | ||
| charge time | 2 hours | — |
| battery life | 21 days | 15 days |
| battery power | 450 mAh | 340 mAh |
| has wireless charging | No | Yes |
| has a removable battery | No | No |
| battery life with GPS on | 35 hours | — |
| Has a solar power battery | No | No |
| has a rechargeable battery | Yes | Yes |
| battery life in training mode | 35 hours | — |
| battery life in power save mode | 840 hours | — |
| Sensors | ||
| has GPS | Yes | Yes |
| has a compass | Yes | — |
| Has a barometer | Yes | No |
| has a gyroscope | Yes | No |
| Has a cadence sensor | 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 | Yes | Yes |
| Features | ||
| release date | 2021-10-12 | 2020-11-18 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| warranty period | 1 years | — |
| Has call control | Yes | No |
| Has silent alarm | Yes | Yes |
| has HRV tracking | No | — |
| measures VO2 max | Yes | — |
| Has notifications | Yes | Yes |
| Has ECG technology | No | No |
| Locates your phone | Yes | No |
| has a front camera | No | — |
| has fall detection | No | No |
| has voice commands | Yes | No |
| Acquires GPS faster | No | No |
| Has vibrating alerts | Yes | Yes |
| number of microphones | 1 | — |
| shows readiness level | No | — |
| Can be used to answer calls | No | No |
| measures resting heart rate | Yes | — |
| has irregular heart rate warnings | Yes | No |
| has fast/slow heart rate notifications | Yes | — |
| Has a built-in camera remote control function | Yes | No |
| Connectivity | ||
| has NFC | No | No |
| supports ANT+ | No | No |
| supports Wi-Fi | No | No |
| supports Galileo | Yes | — |
| Bluetooth version | 5.1 | — |
| has a cellular module | No | No |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| Miscellaneous | ||
| has aptX | No | — |
| Has passcode | Yes | Yes |
| Has auto pause | Yes | — |
| 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 | — |
| 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 |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Tracks BMI | Yes | Yes |
| Has coaching | Yes | — |
| Includes maps | Yes | — |
| Supports routes | Yes | Yes |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has live tracking | Yes | — |
| Has exercise diary | Yes | Yes |
| Predicts ovulation | Yes | — |
| Can be personalised | Yes | Yes |
| Has weight tracking | Yes | Yes |
| Predicts start date | Yes | Yes |
| Tracks water intake | Yes | — |
| Has inactivity alerts | Yes | — |
| Has period notifications | Yes | Yes |
| Has temperature tracking | No | — |
| Provides activity reports | Yes | Yes |
| Displays fertile window notifications | Yes | — |
| Counts how many calories you've burned | Yes | Yes |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | Yes |
| Tracks elevation | 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 | Yes |
| Has exercise tagging | Yes | Yes |
| Has multi-sport mode | Yes | No |
| Tracks calorie intake | Yes | Yes |
| Provides sleep reports | Yes | Yes |
| Detects activities automatically | Yes | No |
| Has a stroke counter for swimming | Yes | No |
Wrist Fit
Amazfit GTR 3
Sits best on wrists ~48–65mm wide (≈ 12.8–17.4cm circumference).
Amazfit Zepp Z
Sits best on wrists ~48–66mm wide (≈ 12.8–17.6cm 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 3 bigger than the Amazfit Zepp Z?
The Amazfit Zepp Z is bigger — 45.9mm vs 45.8mm case width.
Which fits a smaller wrist better, the Amazfit GTR 3 or the Amazfit Zepp Z?
The Amazfit GTR 3 suits wrists around 48–65mm wide, and the Amazfit Zepp Z around 48–66mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Amazfit GTR 3 and Amazfit Zepp Z 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.