Fitbit Flex 2 vs. Fitbit Alta HR vs. Fitbit Charge vs. Polar A370 vs. Amazfit T-Rex
 | | | | | |
| FitbitFlex 2Remove Buy Now | FitbitAlta HRRemove Buy Now | FitbitChargeRemove Buy Now | PolarA370Remove Buy Now | AmazfitT-RexRemove Buy Now |
Basic Info | |||||
| Suggested Price | $100 | $150 | $130 | $179.95 | $140 |
| Release | 2016 | 2017 | 2014 | 2017 | 2019 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | |||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 5 days | 7 days | 7-10 days | Up to 3 days | 20 days |
| Rechargeable | |||||
Compatibility | |||||
| Android | |||||
| iOS | |||||
| Windows Phone | n/a | NA | |||
| Mac | |||||
| Windows | |||||
Connectivity | |||||
| Bluetooth | |||||
| Cellular | |||||
| GPS | |||||
| NFC | |||||
| Wi-Fi | |||||
Display | |||||
| Color | n/a | ||||
| Resolution | n/a | 128 x 36 | NA | 160 x 80 | 360 x 360 |
| Size | n/a | 1.4 inches | NA | 1.18 inches | 1.3 inches |
| Touch | n/a | NA | |||
| Type | LED | OLED | OLED | TFT LCD | AMOLED |
Functions | |||||
| Audio Speaker | |||||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 5 ATM | 1 ATM | WR30 | 5 ATM | |
Notifications | |||||
| Phone | |||||
| Emails | |||||
| Texts | |||||
Software | |||||
| Operating System | n/a | NA | Build-in | ||
| Apps | |||||
| Music | |||||