Polar M400 vs. Apple Watch vs. Casio WSD-F20A vs. Fitbit Alta HR vs. Apple Watch Series 4
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| PolarM400Remove Buy Now | AppleWatchRemove Buy Now | CasioWSD-F20ARemove Buy Now | FitbitAlta HRRemove Buy Now | AppleWatch Series 4Remove Buy Now |
Basic Info | |||||
| Suggested Price | $200 | $349 | $399 | $150 | $329 |
| Release | 2014 | 2015 | 2018 | 2017 | 2018 |
Activity & Fitness | |||||
| Calories | |||||
| Cycling (Bicycling) | |||||
| Distance | |||||
| Heart | n/a | ||||
| Oxygen | |||||
| Sleep | |||||
| Steps | |||||
| Swim | |||||
Battery | |||||
| Duration | 8 hours to 30 days | 18 hours | 1 day | 7 days | Not Yet |
| Rechargeable | |||||
Compatibility | |||||
| Android | |||||
| iOS | |||||
| Windows Phone | n/a | NA | |||
| Mac | NA | ||||
| Windows | NA | ||||
Connectivity | |||||
| Bluetooth | |||||
| Cellular | |||||
| GPS | |||||
| NFC | |||||
| Wi-Fi | |||||
Display | |||||
| Color | |||||
| Resolution | n/a | 340 x 272 or 390 x 312 | 320 x 320 | 128 x 36 | 384 x 480 |
| Size | n/a | 1.5 inches or 1.65 inches | 1.32 inches | 1.4 inches | 1.78 inches |
| Touch | |||||
| Type | n/a | AMOLED | LCD | OLED | MicroLED |
Functions | |||||
| Audio Speaker | Alerts only | ||||
| Clock | |||||
| Phone | |||||
| Vibration | |||||
| Voice | |||||
Hardware | |||||
| Accelerometer | |||||
| Barometer or Altimeter | |||||
| Ultraviolet Sensor | |||||
| Water Resistance | 3 ATM | IPX7 | 5 ATM | Not Yet | |
Notifications | |||||
| Phone | |||||
| Emails | |||||
| Texts | |||||
Software | |||||
| Operating System | n/a | Watch OS | Wear OS | Watch OS 5 | |
| Apps | |||||
| Music | |||||