Polar M400 vs. Fitbit Charge 3 vs. Fitbit Flex vs. Amazfit Verge vs. HTC re Grip
 | | | | | |
| PolarM400Remove Buy Now | FitbitCharge 3Remove Buy Now | FitbitFlexRemove Buy Now | AmazfitVergeRemove Buy Now | HTCre GripRemove Buy Now |
Basic Info | |||||
| Suggested Price | $200 | $150 | $100 | $160 | $199 |
| Release | 2014 | 2018 | 2013 | 2019 | 2020 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | n/a | ||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 8 hours to 30 days | 7 days | 5 days | 5 days | 5 hours to 2.5 days |
| Rechargeable | |||||
Compatibility | |||||
| Android | |||||
| iOS | |||||
| Windows Phone | n/a | NA | NA | ||
| Mac | NA | ||||
| Windows | Not yet | NA | |||
Connectivity | |||||
| Bluetooth | |||||
| Cellular | |||||
| GPS | |||||
| NFC | NA | ||||
| Wi-Fi | |||||
Display | |||||
| Color | |||||
| Resolution | n/a | 66 x 18 | NA | 454x454 | 160 x 32 |
| Size | n/a | .721 inches | NA | 1.39 inches | 1.8 inches |
| Touch | NA | ||||
| Type | n/a | OLED | LED | OMOLED | PMOLED |
Functions | |||||
| Audio Speaker | Alerts only | ||||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 3 ATM | 5 ATM | 1 ATM | IP68 | IP57 |
Notifications | |||||
| Phone | |||||
| Emails | |||||
| Texts | |||||
Software | |||||
| Operating System | n/a | NA | NA | AMAZFIT OS | NA |
| Apps | |||||
| Music | |||||