Amazfit Cheetah Square vs Samsung Galaxy Watch8 - Wi-Fi · 40mmSize, Specs & Wrist Fit Compared
The Samsung Galaxy Watch8 - Wi-Fi · 40mm is 1.7mm wider, 1.3mm shorter, 1.3mm thinner and 7g lighter than the Amazfit Cheetah Square.
Measured against the Amazfit Cheetah Square.
- Case width
- 38.7mmbaseCheetah Square40.4mm+1.7mmGalaxy Watch8 - Wi-Fi · 40mm
- Lug-to-lug
- 44mmbaseCheetah Square42.7mm−1.3mmGalaxy Watch8 - Wi-Fi · 40mm
- Thickness
- 9.9mmbaseCheetah Square8.6mm−1.3mmGalaxy Watch8 - Wi-Fi · 40mm
- Weight
- 37gbaseCheetah Square30g−7gGalaxy Watch8 - Wi-Fi · 40mm
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Amazfit
Cheetah Square
Samsung
Galaxy Watch8 - Wi-Fi · 40mm
Which one fits you
Both need much the same wrist — roughly 45–63mm across the flat of the wrist. Neither will fit where the other won't, so decide on thickness, weight and features instead.
The Samsung Galaxy Watch8 - Wi-Fi · 40mm wears larger than the Amazfit Cheetah Square (40.4mm vs 38.7mm case), giving it more wrist presence — and needing a wider wrist to sit cleanly.
The Samsung Galaxy Watch8 - Wi-Fi · 40mm is the slimmer of the two (8.6mm vs 9.9mm), so it slides under a cuff more easily.
On the wrist the Samsung Galaxy Watch8 - Wi-Fi · 40mm feels lighter (30g vs 37g, case only).
Among the 339 39mm watches we hold thickness for, the Amazfit Cheetah Square is thinner than 74%, so it wears flatter than its width suggests.
Among the 509 40mm watches we hold thickness for, the Samsung Galaxy Watch8 - Wi-Fi · 40mm is thinner than 83%, so it wears flatter than its width suggests.
Specification Comparison
| Spec | AmazfitCheetah Square | SamsungGalaxy Watch8 - Wi-Fi · 40mm |
|---|---|---|
| Case Width | 38.7mm | 40.4mm |
| Lug-to-Lug | 44mm | 42.7mm |
| Thickness | 9.9mm | 8.6mm |
| Weight | 37g | 30g |
| Shape | Rectangle | Circular |
| Water Resistance | 5 ATM | 5 ATM |
| GPS | Yes | Yes |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Screen size | 1.75 inches | 1.34 inches |
| Always-On Display | Yes | Yes |
| Battery life | 8 days | 2 days |
| Battery power | 240 mAh | 325 mAh |
| Has wireless charging | No | Yes |
| Has a removable battery | No | No |
| Has a solar power battery | No | No |
| Has a rechargeable battery | Yes | Yes |
| Has a battery level indicator | Yes | Yes |
| Released | 2023 | 2025 |
Hover a row to highlight that measurement in the schematics below.
2D Dimension Schematics
Every case drawn to scale on a shared centre — from above, and in profile against the wrist. Built from the measurements, so it works for every watch whether or not it has a photo.
- Amazfit Cheetah Square38.7mm × 44mm · 9.9mm thick
- Samsung Galaxy Watch8 - Wi-Fi · 40mm40.4mm × 42.7mm · 8.6mm thick
Amazfit Cheetah Square vs Samsung Galaxy Watch8 - Wi-Fi · 40mm on a wrist
Put Amazfit Cheetah Square and Samsung Galaxy Watch8 - Wi-Fi · 40mm on the same arm, sized to your own wrist, and turn it. Side by side or stacked on one spot, whichever answers the question faster.
- Amazfit Cheetah Square — 38.7mm case, 44mm lug-to-lug, standing 9.9mm off the wrist.
- Samsung Galaxy Watch8 - Wi-Fi · 40mm — 40.4mm case, 42.7mm lug-to-lug, standing 8.6mm off the wrist.
Whether that clears your wrist edges is the question worth answering, and it depends on your wrist rather than on the case diameter.
See them on a wrist in 3DCase shapes are generated from each watch's published measurements — case width, lug-to-lug and thickness — not from manufacturer 3D models, so the proportions are accurate while the dial is generic.
Battery life compared
Furthest apart in Smartwatch mode, where the Amazfit Cheetah Square lasts 4.0× as long as the Samsung Galaxy Watch8 - Wi-Fi · 40mm (8 days against 2 days).
Amazfit Cheetah SquareSamsung Galaxy Watch8 - Wi-Fi · 40mm
Smartwatch
8 days2 daysBattery Saver
28 hours—GPS
13 hours—
Full Specification Comparison
118 specs| Spec | Amazfit Cheetah Square | Samsung Galaxy Watch8 - Wi-Fi · 40mm |
|---|---|---|
| Design | ||
| width | 38.7 | 40.4 |
| height | 44 | 42.7 |
| volume | 16.86 cm³ | 14.84 cm³ |
| weight | 37 g | 30 g |
| thickness | 9.9 | 8.6 |
| ATM rating | 5 ATM | 5 ATM |
| resolution | 390 x 450 px | 438 x 438 px |
| screen size | 1.75 inches | 1.34 inches |
| Display type | OLED/AMOLED | OLED/AMOLED |
| Has a display | Yes | Yes |
| pixel density | 341 ppi | 327 ppi |
| width of band | 20 mm | 20 mm |
| water resistance | Waterproof | Water resistant |
| Always-On Display | Yes | Yes |
| has a touch screen | Yes | Yes |
| is designed for kids | No | No |
| waterproof depth rating | 50 m | 50 m |
| Watch band is replaceable | Yes | Yes |
| Has sapphire glass display | No | Yes |
| Ingress Protection (IP) rating | IP68 | IP68 |
| has branded damage-resistant glass | No | No |
| maximum operating temperature | — | 35 °C |
| lowest potential operating temperature | — | 0 °C |
| Battery | ||
| charge time | 2 hours | — |
| battery life | 8 days | 2 days |
| battery power | 240 mAh | 325 mAh |
| has wireless charging | No | Yes |
| has a removable battery | No | No |
| battery life with GPS on | 13 hours | — |
| Has a solar power battery | No | No |
| has a rechargeable battery | Yes | Yes |
| battery life in power save mode | 28 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 | Yes |
| Monitors blood oxygenation levels | Yes | Yes |
| Features | ||
| release date | 2023-06-22 | 2025-07-09 |
| Has a stopwatch | Yes | Yes |
| Has smart alarm | No | No |
| warranty period | 1 years | — |
| Has call control | No | Yes |
| Has silent alarm | Yes | Yes |
| measures VO2 max | Yes | Yes |
| Has notifications | Yes | Yes |
| Has ECG technology | No | Yes |
| Locates your phone | Yes | Yes |
| has fall detection | No | Yes |
| has voice commands | Yes | Yes |
| Has vibrating alerts | Yes | Yes |
| Can be used to answer calls | No | Yes |
| has irregular heart rate warnings | Yes | Yes |
| Has a built-in camera remote control function | Yes | Yes |
| RAM | — | 2GB |
| has HRV tracking | — | Yes |
| internal storage | — | 32GB |
| Acquires GPS faster | — | Yes |
| shows readiness level | — | Yes |
| measures resting heart rate | — | Yes |
| has fast/slow heart rate notifications | — | Yes |
| Connectivity | ||
| has NFC | No | Yes |
| supports ANT+ | No | No |
| supports Wi-Fi | Yes | Yes |
| supports Galileo | Yes | Yes |
| Bluetooth version | 5.3 | 5.3 |
| has a cellular module | No | No |
| Is compatible with iOS | Yes | No |
| Is compatible with Android | Yes | Yes |
| Wi-Fi version | — | Wi-Fi 4 (802.11n) |
| Miscellaneous | ||
| Has passcode | Yes | Yes |
| Has auto pause | Yes | 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 | 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 | Yes |
| Includes maps | Yes | 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 | Yes |
| Has inactivity alerts | Yes | Yes |
| Has period notifications | Yes | Yes |
| Has temperature tracking | No | Yes |
| 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 | 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 | Yes |
| Has a stroke counter for swimming | No | Yes |
Wrist Fit
Amazfit Cheetah Square
Sits best on wrists ~46–63mm wide (≈ 12.3–16.8cm circumference).
Samsung Galaxy Watch8 - Wi-Fi · 40mm
Sits best on wrists ~45–61mm wide (≈ 12.0–16.3cm circumference).
Frequently Asked Questions
Is the Amazfit Cheetah Square bigger than the Samsung Galaxy Watch8 - Wi-Fi · 40mm?
The Samsung Galaxy Watch8 - Wi-Fi · 40mm is bigger — 40.4mm vs 38.7mm case width.
Which fits a smaller wrist better, the Amazfit Cheetah Square or the Samsung Galaxy Watch8 - Wi-Fi · 40mm?
The Amazfit Cheetah Square suits wrists around 46–63mm wide, and the Samsung Galaxy Watch8 - Wi-Fi · 40mm around 45–61mm. The one with the smaller lower bound is the safer pick for a small wrist.
Can I see the Amazfit Cheetah Square and Samsung Galaxy Watch8 - Wi-Fi · 40mm 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.