The Charge 5 features aĭaily Readiness Score, which uses information from your exercise, sleep and heart rate metrics to help you optimize workout and rest periods. It also has an electrodermal activity stress monitor, plus an on-board electrocardiogram sensor for tracking your heart health. It keeps almost all of the upgrades popular in the Charge 4, while managing to be 10% thinner and sleeker-looking overall. The newly released Fitbit Charge 5 has even more to offer, at least at first blush. While it’s great to have GPS technology, especially if you are a runner, biker or hiker, this function can use up a lot of power and reduce your Fitbit’s battery life quite quickly. The display is also hard to read in bright daylight which can be frustrating for outdoor athletes.

It makes checking notifications difficult because you can’t see more than a few words on the screen. The Charge 4’s screen has better backlighting than the 3 so it can adjust to different lighting conditions, but the relatively low resolution limits the amount of data that can be shown at one time. One of the biggest gripes with the Fitbit Charge 4 (and 3) is its monochrome OLED display.

Fitbit charge 4 v 5