Fitbit Flex 2 vs. Fitbit Charge 3 vs. Apple Watch Series 4 vs. Amazfit T-Rex
 | | | | |
| FitbitFlex 2Remove Buy Now | FitbitCharge 3Remove Buy Now | AppleWatch Series 4Remove Buy Now | AmazfitT-RexRemove Buy Now |
Basic Info | |||||
| Suggested Price | $100 | $150 | $329 | $140 | |
| Release | 2016 | 2018 | 2018 | 2019 | |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | |||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 5 days | 7 days | Not Yet | 20 days | |
| Rechargeable | |||||
Compatibility | |||||
| Android | |||||
| iOS | |||||
| Windows Phone | n/a | ||||
| Mac | |||||
| Windows | Not yet | ||||
Connectivity | |||||
| Bluetooth | |||||
| Cellular | |||||
| GPS | |||||
| NFC | NA | ||||
| Wi-Fi | |||||
Display | |||||
| Color | n/a | ||||
| Resolution | n/a | 66 x 18 | 384 x 480 | 360 x 360 | |
| Size | n/a | .721 inches | 1.78 inches | 1.3 inches | |
| Touch | n/a | ||||
| Type | LED | OLED | MicroLED | AMOLED | |
Functions | |||||
| Audio Speaker | |||||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 5 ATM | 5 ATM | Not Yet | 5 ATM | |
Notifications | |||||
| Phone | |||||
| Emails | |||||
| Texts | |||||
Software | |||||
| Operating System | n/a | NA | Watch OS 5 | Build-in | |
| Apps | |||||
| Music | |||||