Greyscale instead of colour, this is a simple screen designed to deliver useful information instead of wowing you with HD graphics. Much of the slightly curved glass front is taken up by the display. You’ll quickly forget you are wearing it, and we even found the charge 4 comfy enough to wear at night without being annoying. The all-black case won’t win any awards for its beauty, but it is functional and does the job without taking up much space on the wrist. The strap does not attach using the industry-standard lug bars of a wristwatch, but it can be quickly removed and replaced if you want to give your Fitbit a different look.

The charge 4 is light and discreet, slipping beneath a shift cuff or jumper sleeve without drawing attention to itself. It is more compact than a smartwatch or dedicated running watch, but crams into its slim case enough features to fulfil the main duties of both of these devices. To our eyes, the Fitbit charge 4 is the archetypal fitness tracker.

Features: Sleep score, stress management, menstrual health tracking, GPS, contactless payments.Sensors: Heart rate, movement, sleep, skin temperature, GPS, NFC.

Fitbit 4