Amazfit Active 2 vs Garmin Instinct 3 Solar Tactical Edition 45mmSize, Specs & Wrist Fit Compared
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Amazfit
Active 2
Garmin
Instinct 3 Solar Tactical Edition 45mm
Which one fits you
Both need much the same wrist — roughly 46–64mm across the flat of the wrist. Neither will fit where the other won't, so decide on thickness, weight and features instead.
The Garmin Instinct 3 Solar Tactical Edition 45mm wears larger than the Amazfit Active 2 (45mm vs 43.9mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Amazfit Active 2 is the slimmer of the two (9.9mm vs 14.9mm), so it slides under a cuff more easily.
On the wrist the Amazfit Active 2 feels lighter (29.5g vs 52g, case only).
Among the 316 44mm watches we hold thickness for, the Amazfit Active 2 is thinner than 99%, 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 2 | GarminInstinct 3 Solar Tactical Edition 45mm |
|---|---|---|
| Case Width | 43.9mm | 45mm |
| Thickness | 9.9mm | 14.9mm |
| Weight | 29.5g | 52g |
| Shape | Circular | Circular |
| Water Resistance | 5 ATM | 10 ATM |
| GPS | 21 hours | 130 hours |
| Display | 1.32 inches | 0.9 inches |
| Always-On Display | Yes | Yes |
| Charge time | 2 hours | — |
| Battery life | 10 days | Unlimited days |
| Battery power | 270 mAh | — |
| Has wireless charging | No | No |
| Has a removable battery | No | No |
| Battery life with GPS on | 21 hours | 130 hours |
| Has a solar power battery | No | Yes |
| Has a rechargeable battery | Yes | Yes |
| Battery life in power save mode | 456 hours | — |
| Has a battery level indicator | Yes | Yes |
| Battery life in training mode | — | 40 hours |
| Released | 2025 | 2025 |
Battery life compared
The two are closest in everyday use and furthest apart in GPS mode, where one lasts 6.2× as long as the other (5.4 days against 21 hours).
Amazfit Active 2Garmin Instinct 3 Solar Tactical Edition 45mm
Battery Saver
456 hours—Smartwatch
10 days—GPS
21 hours130 hoursTraining
—40 hours
Full Specification Comparison
123 specs| Spec | Amazfit Active 2 | Garmin Instinct 3 Solar Tactical Edition 45mm |
|---|---|---|
| Design | ||
| width | 43.9 | 45 |
| height | 43.9 | 45 |
| volume | 19.08 cm³ | 30.17 cm³ |
| weight | 29.5 g | 52 g |
| thickness | 9.9 | 14.9 |
| ATM rating | 5 ATM | 10 ATM |
| resolution | 466 x 466 px | 176 x 176 px |
| screen size | 1.32 inches | 0.9 inches |
| Display type | OLED/AMOLED | LCD |
| Has a display | Yes | Yes |
| pixel density | 353 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 | Yes | No |
| has branded damage-resistant glass | No | No |
| Battery | ||
| charge time | 2 hours | — |
| battery life | 10 days | Unlimited days |
| battery power | 270 mAh | — |
| has wireless charging | No | No |
| has a removable battery | No | No |
| battery life with GPS on | 21 hours | 130 hours |
| Has a solar power battery | No | Yes |
| has a rechargeable battery | Yes | Yes |
| battery life in power save mode | 456 hours | — |
| battery life in training mode | — | 40 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 | Yes | 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 | 2025-01-06 | 2025-04-30 |
| Has a stopwatch | Yes | Yes |
| Has call control | Yes | No |
| Has silent alarm | Yes | Yes |
| has HRV tracking | Yes | Yes |
| measures VO2 max | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | No | — |
| Locates your phone | Yes | Yes |
| has a front camera | No | — |
| has fall detection | No | Yes |
| has voice commands | Yes | 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 | Yes | No |
| has fast/slow heart rate notifications | Yes | Yes |
| Has a built-in camera remote control function | Yes | No |
| Has smart alarm | — | No |
| warranty period | — | 1 years |
| internal storage | — | 0.13GB |
| Connectivity | ||
| has NFC | Yes | Yes |
| supports ANT+ | No | Yes |
| supports Wi-Fi | Yes | No |
| supports Galileo | Yes | 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 |
| number of exercises | 160 | — |
| 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 | Yes | 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 |
| Has multi-sport mode | 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 |
Wrist Fit
Amazfit Active 2
Sits best on wrists ~46–63mm wide (≈ 12.3–16.8cm 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 2 bigger than the Garmin Instinct 3 Solar Tactical Edition 45mm?
The Garmin Instinct 3 Solar Tactical Edition 45mm is bigger — 45mm vs 43.9mm case width.
Which fits a smaller wrist better, the Amazfit Active 2 or the Garmin Instinct 3 Solar Tactical Edition 45mm?
The Amazfit Active 2 suits wrists around 46–63mm 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 2 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.