Galaxy Watch8 40mm vs Garmin Instinct 3 AMOLED 45mm
Which one should you buy?
Who leads where?
- Health Sensors and FeaturesGalaxy Watch8 40mm
- KasaGalaxy Watch8 40mm
- Battery and ChargingGarmin Instinct 3 AMOLED 45mm
- Water and Dust ResistanceGalaxy Watch8 40mm
- PerformanceGalaxy Watch8 40mm
- ConnectivityGalaxy Watch8 40mm
Wins are counted from the official values in the table below; the BUY / CONSIDER / WAIT call comes from each product's own decision box. We do not predict prices.
 SamsungGalaxy Watch8 40mmNo reviews yet |  GarminGarmin Instinct 3 AMOLED 45mmNo reviews yet | |
|---|---|---|
| Key Differences | ||
| Case Size | 40 mm | 45 mm |
| Battery Life | up to 40 hours | up to 168 hours |
| ECG App | Yes | — |
| Water Resistance | 5 ATM | 10 ATM |
| Health Sensors and Features | ||
| Heart Rate Sensor | Yes | Yes |
| SpO2 Sensor | Yes | Yes |
| ECG Sensor | Yes | — |
| Skin Temperature Sensor | Yes | Yes |
| ECG App | Yes | — |
| Atrial Fibrillation Notification | Yes | — |
| Sleep Tracking | Yes | Yes |
| Fall Detection | Yes | — |
| Crash Detection | — | Yes |
| Display | ||
| Size | 1.3" | 1.2" |
| Panel | Super AMOLED | AMOLED |
| Resolution | 438x438 | 390x390 |
| Peak Brightness | 3000 nit | — |
| Always-On Display | Yes | Yes |
| Kasa | ||
| Case Size | 40 mm | 45 mm |
| Case Thickness | 8.6 mm | 14.9 mm |
| Weight | 30.0 g | 53 g |
| Case Material | Aluminum | Fibre-reinforced polymer |
| Front Glass | — | Chemically strengthened glass |
| Strap Width | — | 22 mm |
| Positioning and GNSS | ||
| GNSS Receiver | Yes | Yes |
| Dual-Band GNSS | Yes | Yes |
| GNSS Systems | GPS, Glonass, Beidou, Galileo | GPS, GLONASS, Galileo, QZSS, BeiDou |
| Battery and Charging | ||
| The figure the maker states | up to 40 hours | up to 168 hours |
| What that figure measures | With always-on display off | With always-on display on |
| Capacity | 325 mAh | — |
| Charging Type | — | Garmin proprietary charging cable |
| Water and Dust Resistance | ||
| Water Resistance | 5 ATM | 10 ATM |
| IP Rating | IP68 | — |
| MIL-STD-810 | MIL-STD-810H | — |
| Performance | ||
| RAM | 2 GB | — |
| Storage | 32 GB | 4 GB |
| Connectivity | ||
| Cellular | Optional | — |
| Wi-Fi | Wi-Fi 4 | — |
| Bluetooth | 5.3 | — |
| NFC | Yes | — |
| Software | ||
| Operating System | Wear OS | — |
| Phone Compatibility | — | iPhone and Android |
Galaxy Watch8 40mm leads on 10 of 12 compared specs.
This table is based on manufacturers official specifications. Winning on paper does not always mean a difference in everyday use.