Polar M400 vs. Fitbit Ionic vs. Fitbit Charge vs. Apple Watch 7
 | | | | |
| PolarM400Remove Buy Now | FitbitIonicRemove Buy Now | FitbitChargeRemove Buy Now | AppleWatch 7Remove Buy Now |
Basic Info | ||||
| Suggested Price | $200 | $299 | $130 | $429 |
| Release | 2014 | 2017 | 2014 | 2021 |
Activity & Fitness | ||||
| Calories | ||||
| Cycling (Bicycling) | ||||
| Distance | ||||
| Heart | n/a | |||
| Oxygen | ||||
| Sleep | ||||
| Steps | ||||
| Swim | ||||
Battery | ||||
| Duration | 8 hours to 30 days | 4+ days | 7-10 days | 18 Hours |
| Rechargeable | ||||
Compatibility | ||||
| Android | ||||
| iOS | ||||
| Windows Phone | n/a | NA | ||
| Mac | ||||
| Windows | ||||
Connectivity | ||||
| Bluetooth | ||||
| Cellular | ||||
| GPS | ||||
| NFC | ||||
| Wi-Fi | ||||
Display | ||||
| Color | ||||
| Resolution | n/a | 348x250 | NA | 396 x 484 |
| Size | n/a | 1.42 | NA | 1.9 inches |
| Touch | NA | |||
| Type | n/a | OLED | OLED | MicroLED |
Functions | ||||
| Audio Speaker | Alerts only | |||
| Clock | ||||
| Phone | ||||
| Vibration | ||||
| Voice | ||||
Hardware | ||||
| Accelerometer | ||||
| Barometer or Altimeter | ||||
| Ultraviolet Sensor | ||||
| Water Resistance | 3 ATM | 50m | 1 ATM | water resistant but not waterproof |
Notifications | ||||
| Phone | ||||
| Emails | ||||
| Texts | ||||
Software | ||||
| Operating System | n/a | Fitbit OS | NA | WatchOS 8 |
| Apps | ||||
| Music | ||||