Polar M400 vs. Amazfit Arc vs. Fitbit Charge vs. Fitbit Charge 3 vs. Polar A370
 | | | | | |
| PolarM400Remove Buy Now | AmazfitArcRemove Buy Now | FitbitChargeRemove Buy Now | FitbitCharge 3Remove Buy Now | PolarA370Remove Buy Now |
Basic Info | |||||
| Suggested Price | $200 | $69.99 | $130 | $150 | $179.95 |
| Release | 2014 | 2016 | 2014 | 2018 | 2017 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | n/a | ||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 8 hours to 30 days | 20 days | 7-10 days | 7 days | Up to 3 days |
| Rechargeable | |||||
Compatibility | |||||
| Android | |||||
| iOS | |||||
| Windows Phone | n/a | NA | |||
| Mac | |||||
| Windows | Not yet | ||||
Connectivity | |||||
| Bluetooth | |||||
| Cellular | |||||
| GPS | |||||
| NFC | NA | ||||
| Wi-Fi | |||||
Display | |||||
| Color | |||||
| Resolution | n/a | 72 x40 | NA | 66 x 18 | 160 x 80 |
| Size | n/a | 0.42 inches | NA | .721 inches | 1.18 inches |
| Touch | NA | ||||
| Type | n/a | OLED | OLED | OLED | TFT LCD |
Functions | |||||
| Audio Speaker | Alerts only | ||||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 3 ATM | IP67 | 1 ATM | 5 ATM | WR30 |
Notifications | |||||
| Phone | |||||
| Emails | |||||
| Texts | |||||
Software | |||||
| Operating System | n/a | NA | NA | ||
| Apps | |||||
| Music | |||||