Fitbit Flex 2 vs. Asus VivoWatch vs. Fitbit Charge vs. Fitbit Charge 3 vs. Apple Watch Series 4
 | | | | | |
| FitbitFlex 2Remove Buy Now | AsusVivoWatchRemove Buy Now | FitbitChargeRemove Buy Now | FitbitCharge 3Remove Buy Now | AppleWatch Series 4Remove Buy Now |
Basic Info | |||||
| Suggested Price | $100 | $160 | $130 | $150 | $329 |
| Release | 2016 | 2018 | 2014 | 2018 | 2018 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | |||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 5 days | 24 hours to 10 days | 7-10 days | 7 days | Not Yet |
| Rechargeable | |||||
Compatibility | |||||
| Android | |||||
| iOS | |||||
| Windows Phone | n/a | NA | NA | ||
| Mac | NA | ||||
| Windows | NA | Not yet | |||
Connectivity | |||||
| Bluetooth | |||||
| Cellular | |||||
| GPS | |||||
| NFC | NA | ||||
| Wi-Fi | |||||
Display | |||||
| Color | n/a | ||||
| Resolution | n/a | 128 x 128 | NA | 66 x 18 | 384 x 480 |
| Size | n/a | NA | NA | .721 inches | 1.78 inches |
| Touch | n/a | NA | |||
| Type | LED | NA | OLED | OLED | MicroLED |
Functions | |||||
| Audio Speaker | |||||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | NA | ||||
| Ultraviolet Sensor | |||||
| Water Resistance | 5 ATM | IP67 | 1 ATM | 5 ATM | Not Yet |
Notifications | |||||
| Phone | |||||
| Emails | |||||
| Texts | |||||
Software | |||||
| Operating System | n/a | KoodOS | NA | NA | Watch OS 5 |
| Apps | |||||
| Music | |||||