Basic Info |
| Suggested Price | $329 | $595 | $120 | $199 | $429 |
| Release | 2017 | 2015 | 2015 | 2020 | 2021 |
Activity & Fitness |
| Calories | | n/a | | | |
| Cycling (Bicycling) | | n/a | | | |
| Distance | | n/a | | | |
| Heart | | n/a | n/a | | |
| Oxygen | | n/a | | | |
| Sleep | | n/a | | | |
| Steps | | n/a | | | |
| Swim | | n/a | | | |
Battery |
| Duration | 18 hours | 2 days | 8 days (without notifications) | 5 hours to 2.5 days | 18 Hours |
| Rechargeable | | | | | |
Compatibility |
| Android | | | | | |
| iOS | | | | | |
| Windows Phone | | n/a | n/a | NA | |
| Mac | | n/a | n/a | NA | |
| Windows | | n/a | n/a | NA | |
Connectivity |
| Bluetooth | | | | | |
| Cellular | | | | | |
| GPS | | n/a | | | |
| NFC | | n/a | | | |
| Wi-Fi | | | | | |
Display |
| Color | | | | | |
| Resolution | 340 x 272 or 390 x 312 | n/a | n/a | 160 x 32 | 396 x 484 |
| Size | 1.5 inches or 1.65 inches | n/a | n/a | 1.8 inches | 1.9 inches |
| Touch | | | | | |
| Type | AMOLED | n/a | LED | PMOLED | MicroLED |
Functions |
| Audio Speaker | | n/a | | | |
| Clock | | | | | |
| Phone | | n/a | | | |
| Vibration | | n/a | | | |
| Voice | | | | | |
Hardware |
| Accelerometer | | n/a | | | |
| Barometer or Altimeter | | n/a | | | |
| Ultraviolet Sensor | | | | | |
| Water Resistance | 5 ATM | 5 ATM | 2 ATM | IP57 | water resistant but not waterproof |
Notifications |
| Phone | | n/a | | | |
| Emails | | | | | |
| Texts | | | | | |
Software |
| Operating System | WatchOS 4 | n/a | n/a | NA | WatchOS 8 |
| Apps | | n/a | | | |
| Music | | | | | |
