Polar M400 vs. ASUS ZenWatch 3 vs. Asus ZenWatch vs. Fitbit Charge 3 vs. HTC re Grip
 | | | | | |
| PolarM400Remove Buy Now | ASUSZenWatch 3Remove Buy Now | AsusZenWatchRemove Buy Now | FitbitCharge 3Remove Buy Now | HTCre GripRemove Buy Now |
Basic Info | |||||
| Suggested Price | $200 | $229 | $150 | $150 | $199 |
| Release | 2014 | 2017 | 2014 | 2018 | 2020 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | n/a | ||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 8 hours to 30 days | 48 hours | NA | 7 days | 5 hours to 2.5 days |
| Rechargeable | |||||
Compatibility | |||||
| Android | |||||
| iOS | |||||
| Windows Phone | n/a | NA | NA | ||
| Mac | NA | NA | |||
| Windows | NA | Not yet | NA | ||
Connectivity | |||||
| Bluetooth | Yes | ||||
| Cellular | |||||
| GPS | |||||
| NFC | NA | ||||
| Wi-Fi | |||||
Display | |||||
| Color | |||||
| Resolution | n/a | 400 x 400 | 320 x 320 | 66 x 18 | 160 x 32 |
| Size | n/a | 1.39 inches | 1.63 inches | .721 inches | 1.8 inches |
| Touch | |||||
| Type | n/a | AMOLED | AMOLED | OLED | PMOLED |
Functions | |||||
| Audio Speaker | Alerts only | ||||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 3 ATM | IP55 | 5 ATM | IP57 | |
Notifications | |||||
| Phone | |||||
| Emails | NA | ||||
| Texts | NA | ||||
Software | |||||
| Operating System | n/a | Android Wear 2 | Android Wear | NA | NA |
| Apps | |||||
| Music | |||||