Amazfit Active vs Garmin Instinct 3 Solar Tactical Edition 45mmSize, Specs & Wrist Fit Compared
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Amazfit
Active
Garmin
Instinct 3 Solar Tactical Edition 45mm
Which one fits you
On wrists narrower than about 47mm, the Amazfit Active is the safer pick — it stays proportionate down to roughly 38mm, where the Garmin Instinct 3 Solar Tactical Edition 45mm starts to hang over the edge. Above 47mm both sit cleanly, and the Garmin Instinct 3 Solar Tactical Edition 45mm gives you more presence.
The Garmin Instinct 3 Solar Tactical Edition 45mm wears larger than the Amazfit Active (45mm vs 42.36mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Amazfit Active is the slimmer of the two (10.75mm vs 14.9mm), so it slides under a cuff more easily.
On the wrist the Amazfit Active feels lighter (27g vs 52g, case only).
Among the 723 42mm watches we hold thickness for, the Amazfit Active is thinner than 87%, so it wears flatter than its width suggests.
Among the 386 45mm watches we hold thickness for, the Garmin Instinct 3 Solar Tactical Edition 45mm is thicker than 83% — it will sit high even though the case width reads modest.
Specification Comparison
| Spec | AmazfitActive | GarminInstinct 3 Solar Tactical Edition 45mm |
|---|---|---|
| Case Width | 42.36mm | 45mm |
| Lug-to-Lug | 35.9mm | 45mm |
| Thickness | 10.75mm | 14.9mm |
| Weight | 27g | 52g |
| Shape | Rectangle | Circular |
| Water Resistance | 5 ATM | 10 ATM |
| GPS | 16 hours | 130 hours |
| Display | 1.75 inches | 0.9 inches |
| Always-On Display | Yes | Yes |
| Charge time | 2 hours | — |
| Battery life | 14 days | Unlimited days |
| Battery power | 300 mAh | — |
| Has wireless charging | No | No |
| Has a removable battery | No | No |
| Battery life with GPS on | 16 hours | 130 hours |
| Has a solar power battery | No | Yes |
| Has a rechargeable battery | Yes | Yes |
| Battery life in training mode | 240 hours | 40 hours |
| Battery life in power save mode | 720 hours | — |
| Has a battery level indicator | Yes | Yes |
| Released | 2023 | 2025 |
Battery life compared
The two are closest in everyday use and furthest apart in GPS mode, where one lasts 8.1× as long as the other (5.4 days against 16 hours).
Amazfit ActiveGarmin Instinct 3 Solar Tactical Edition 45mm
Battery Saver
720 hours—Smartwatch
14 days—Training
240 hours40 hoursGPS
16 hours130 hours
Full Specification Comparison
121 specs| Spec | Amazfit Active | Garmin Instinct 3 Solar Tactical Edition 45mm |
|---|---|---|
| Design | ||
| width | 42.36 | 45 |
| height | 35.9 | 45 |
| volume | 16.35 cm³ | 30.17 cm³ |
| weight | 27 g | 52 g |
| thickness | 10.75 | 14.9 |
| ATM rating | 5 ATM | 10 ATM |
| resolution | 390 x 450 px | 176 x 176 px |
| screen size | 1.75 inches | 0.9 inches |
| Display type | OLED/AMOLED | LCD |
| Has a display | Yes | Yes |
| pixel density | 341 ppi | 276 ppi |
| width of band | 20 mm | 22 mm |
| water resistance | Water resistant | Waterproof |
| Always-On Display | Yes | Yes |
| has a touch screen | Yes | No |
| is designed for kids | No | — |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | No |
| has branded damage-resistant glass | No | No |
| Battery | ||
| charge time | 2 hours | — |
| battery life | 14 days | Unlimited days |
| battery power | 300 mAh | — |
| has wireless charging | No | No |
| has a removable battery | No | No |
| battery life with GPS on | 16 hours | 130 hours |
| Has a solar power battery | No | Yes |
| has a rechargeable battery | Yes | Yes |
| battery life in training mode | 240 hours | 40 hours |
| battery life in power save mode | 720 hours | — |
| Sensors | ||
| has GPS | Yes | Yes |
| has a compass | Yes | Yes |
| Has a barometer | No | Yes |
| has a gyroscope | No | Yes |
| Has a cadence sensor | No | Yes |
| has an accelerometer | Yes | Yes |
| Monitors perspiration | No | No |
| Has a heart rate monitor | Yes | Yes |
| Has a temperature sensor | Yes | Yes |
| Monitors blood oxygenation levels | Yes | Yes |
| Features | ||
| release date | 2023-10-27 | 2025-04-30 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| warranty period | 1 years | 1 years |
| Has call control | Yes | No |
| Has silent alarm | Yes | Yes |
| has HRV tracking | Yes | Yes |
| internal storage | 0.25GB | 0.13GB |
| Has notifications | Yes | Yes |
| Has ECG technology | No | — |
| Locates your phone | Yes | Yes |
| has fall detection | No | Yes |
| has voice commands | No | No |
| Acquires GPS faster | Yes | Yes |
| Has vibrating alerts | Yes | Yes |
| number of microphones | 1 | — |
| shows readiness level | Yes | Yes |
| Can be used to answer calls | Yes | No |
| measures resting heart rate | Yes | Yes |
| has irregular heart rate warnings | No | No |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | No | No |
| measures VO2 max | — | Yes |
| Connectivity | ||
| has NFC | No | Yes |
| supports ANT+ | No | Yes |
| supports Wi-Fi | No | No |
| supports Galileo | No | Yes |
| Bluetooth version | 5.2 | — |
| has a cellular module | No | No |
| Is compatible with iOS | Yes | Yes |
| Is compatible with Android | Yes | Yes |
| Miscellaneous | ||
| Has passcode | Yes | — |
| Has auto pause | Yes | Yes |
| Is compatible with Windows | No | Yes |
| Is compatible with Mac OS X | No | Yes |
| 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 |
| Available on PC | — | Yes |
| Can upload maps | — | No |
| Has trackback mode | — | Yes |
| Has a wind speed sensor | — | No |
| Provides the sunrise/sunset time | — | Yes |
| Informs about the risk of thunderstorms | — | Yes |
| App & Software | ||
| Ad-free | Yes | Yes |
| Free app | Yes | Yes |
| Tracks BMI | Yes | Yes |
| Has coaching | Yes | Yes |
| Includes maps | Yes | Yes |
| Supports routes | Yes | Yes |
| Has achievements | Yes | Yes |
| Has goal setting | Yes | Yes |
| Has live tracking | Yes | Yes |
| Has exercise diary | Yes | Yes |
| Predicts ovulation | Yes | Yes |
| Can be personalised | Yes | Yes |
| Has weight tracking | Yes | Yes |
| Predicts start date | Yes | Yes |
| Tracks water intake | Yes | Yes |
| Has inactivity alerts | Yes | Yes |
| Has period notifications | Yes | Yes |
| Has temperature tracking | Yes | Yes |
| Provides activity reports | Yes | Yes |
| Displays fertile window notifications | Yes | Yes |
| Counts how many calories you've burned | Yes | Yes |
| Doesn’t require account | — | No |
| Activity tracking | ||
| Measures pace | Yes | Yes |
| Tracks distance | Yes | Yes |
| Tracks elevation | Yes | Yes |
| Designed for golf | No | Yes |
| 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 |
| Tracks calorie intake | Yes | Yes |
| Provides sleep reports | Yes | Yes |
| Detects activities automatically | Yes | Yes |
| Has a stroke counter for swimming | Yes | Yes |
| Has multi-sport mode | — | Yes |
Wrist Fit
Amazfit Active
Sits best on wrists ~38–51mm wide (≈ 10.1–13.6cm circumference).
Garmin Instinct 3 Solar Tactical Edition 45mm
Sits best on wrists ~47–64mm wide (≈ 12.6–17.1cm 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 Active bigger than the Garmin Instinct 3 Solar Tactical Edition 45mm?
The Garmin Instinct 3 Solar Tactical Edition 45mm is bigger — 45mm vs 42.36mm case width.
Which fits a smaller wrist better, the Amazfit Active or the Garmin Instinct 3 Solar Tactical Edition 45mm?
The Amazfit Active suits wrists around 38–51mm wide, and the Garmin Instinct 3 Solar Tactical Edition 45mm around 47–64mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Amazfit Active and Garmin Instinct 3 Solar Tactical Edition 45mm 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.