5. Fitbit Versa 4 is the best Fitbit for sleep and SpO2 tracking
The Fitbit Versa 4 smartwatch is a complete fitness tracker with built-in GPS and all the activity measurements you could want.
Like all Fitbits, it’s also a great sleep tracker and boasts an automatic sleep mode that automatically detects when you’re sleeping – no need to put it to “sleep” mode like with other trackers.
It measures the duration of sleep and divides it into three stages of sleep: light sleep, deep sleep and REM sleep.
Along with recovery (which measures your sleep heart rate compared to your resting daytime heart rate), it gives you a nighttime sleep score of 100 and details on how to improve your sleep quality.
Like the top Fitbit Sense, the Versa 4 also measures SpO2. SpO2 at night is usually lower than SpO2 during the day, because the respiratory rate is lower on average during sleep.
And of course, you get all the fitness measurements (heart rate, cardio metrics, and exercise modes) and smartwatch features (phone calls on your wrist, message notifications), albeit with notable omissions from Google Assistant and music controls compared to the Versa. 3.