Basic Info |
| Wear Type | Wristband | Wristband | |
| Price | $10399 | $18000 | Polar A370 is 170% cheaper |
| Ratings | | | |
Activity & Fitness |
| Activity | Yes | Yes | Both track daily activity |
| Calories | Yes | Yes | Both track calories burned |
| Sleep | Yes | Yes | Both can track your sleep |
| Heart Rate / Pulse | Yes | No | Polar A370 has built-in heart rate monitor |
| External HR Monitor | No | Yes | |
| VO2 Max | No | Yes | Polar M400 shows the maximum volume of oxygen you can consume per minute |
| Distance | Yes | Yes | Both track your running/walking distance |
| Steps | Yes | Yes | Both track how many steps you take |
| Pace | No | Yes | |
| Stairs / Floors | No | Yes | Polar M400 counts your climbing stairs or floors |
| Exercise Tagging | Yes | No | Only Polar A370 provides exercise tagging |
| Smart Coach | Yes | Yes | Both can help with smart coaching |
| Goal Setting | Yes | Yes | Both can help with your goals setting |
| Inactivity Alert | n/a | Yes | Polar M400 helps you stay active with inactivity alert |
Additional Features |
| GPS | Yes | Yes | Both have integrated GPS modules |
| Compass | n/a | No | Both don't have a compass |
| Watch / Clock | Yes | Yes | Both have watch |
| Alarm Clock | Yes | Yes | Both have alarm clock |
| Reminders | No | Yes | Polar M400 has a reminder option |
| Stopwatch | Yes | No | Polar A370 has a stopwatch |
| Music Playback | n/a | No | Both don't have music playback |
| Reports | Activity, Sleep | Activity, Sleep | |
Smartphone Remote Features |
| Notifications | Yes | Yes | Both show smartphone notifications |
| Caller ID | Yes | Yes | Both show caller ID notification |
| Music Control | No | No | Both don't have phone music control |
| Call Control | n/a | Yes | Polar M400 allows you control phone calls |
| Camera Control | n/a | No | Both don't have camera control |
| Find Phone | n/a | No | Both don't have a find phone feature |
Battery |
| Duration | 4 days | 24 days | Polar M400 battery life is about 6.0 times longer |
| Battery Type | Rechargeable Battery | Rechargeable Battery | |
Physical Specs |
| Weather Resistance | Yes | Yes | |
| Waterproof | Yes | No | |
| IP Rating | n/a | 3 ATM | |
| Weight | 37 grams | 57 grams | Polar A370 is 20.0 g lighter |
User Interface |
| Display | Yes | Yes | |
| Display Size | n/a | n/a | |
| Screen Resolution |
n/a
|
128 x 128 pixels
| |
| Color Display | n/a | No | |
| Touch Screen | n/a | No | |
Compatibility |
| Android | n/a | Yes | Polar M400 is compatibles with Android phones and tablets |
| iOS | Yes | Yes | Both compatible iOS devices |
| OS X/Mac | No | Yes | Polar M400 compatibles with MacBooks and iMacs |
| Windows Phone | Yes | Yes | Both compatible with Windows Phone devices |
| Windows | No | Yes | Polar M400 allows you to locate your phone |
| Web Portal | Yes | Yes | Both have access to online web portal |
| Social Features | n/a | Yes | You can integrate Polar M400 with social networks and share information |
Connectivity |
| Bluetooth | Yes | Yes | Both have Bluetooth data transfer technology |
| Wi-Fi | n/a | No | Both don't have Wi-Fi connection |
| NFC | n/a | No | Both don't have NFC connectivity |
| ANT+ | n/a | No | Both don't provide ANT+ wireless technology |
| Buy on Amazon | Buy on Amazon | |
