Fitbit Flex 2 vs. Fitbit Ionic vs. Fitbit Alta HR vs. Fitbit Charge 3 vs. Apple Watch Series 4
 | | | | | |
| FitbitFlex 2Remove Buy Now | FitbitIonicRemove Buy Now | FitbitAlta HRRemove Buy Now | FitbitCharge 3Remove Buy Now | AppleWatch Series 4Remove Buy Now |
Basic Info | |||||
| Suggested Price | $100 | $299 | $150 | $150 | $329 |
| Release | 2016 | 2017 | 2017 | 2018 | 2018 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | |||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 5 days | 4+ days | 7 days | 7 days | Not Yet |
| 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 | 348x250 | 128 x 36 | 66 x 18 | 384 x 480 |
| Size | n/a | 1.42 | 1.4 inches | .721 inches | 1.78 inches |
| Touch | n/a | ||||
| Type | LED | OLED | OLED | OLED | MicroLED |
Functions | |||||
| Audio Speaker | |||||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 5 ATM | 50m | 5 ATM | Not Yet | |
Notifications | |||||
| Phone | |||||
| Emails | |||||
| Texts | |||||
Software | |||||
| Operating System | n/a | Fitbit OS | NA | Watch OS 5 | |
| Apps | |||||
| Music | |||||