Polar Ignite review: Clever fitness perks marred by too many compromises

At $229, the Polar Ignite is more affordable than the Vantage M or V smartwatches, but it has more capabilities as a GPS watch than something like Polar's A370 fitness band Polar has put more emphasis on sleep tracking as of late, and the Ignite shows off a few new metrics that help users understand the quality of the rest they get each night Using its motion sensors and heart-rate monitor, the Ignite estimates how long you spend in light, deep, and REM sleep-like many newer wearables do-and gives you a sleep score each night based off that data.

Polar's "Sleep charge" metric compares your current night's sleep score to previous ones to let you know how "Normal" your current night's sleep is compared to how you usually sleep Most people will get more use out of sleep scores than sleep charge Almost every modern wearable that tracks sleep provides users with a sleep score in the morning, and that singular number makes it easy to understand how well you slept the previous night.

Nightly recharge only takes into account your body's state during sleep time, whereas Garmin's body battery also considers periods of "rest' throughout the day in addition to nightly sleep. . Source