Fitbit Versa 4

Fitbit Versa 4 is a watch from 2022, sitting in the mid-range band at an indicative $229.

It reads 18 of the 33 signals this comparison tracks. Full coverage of activity. Nothing at all from body composition. Rarer readings it does take: sleep efficiency.

By sensor class: 1 at clinical grade and 13 at consumer grade. That grade is my classification of the hardware, not a lab test. Those readings come from an optical heart rate sensor, an optical blood oxygen sensor, a skin temperature sensor, a GPS receiver, a barometer and an accelerometer. Blood oxygen is measured through the night, not continuously through the day.

Its 6 days per charge are the 68th longest of the 74 devices of its kind here that publish a figure. The AMOLED screen can stay always on. Built-in GPS. Rated 5ATM / 50m, fine for swimming. It weighs 37.64 g. On top of the tracking it also handles contactless payments. Case size 40.5mm. No subscription is required.

Fitness smartwatch; SpO2/skin-temp/GPS/altimeter but no ECG and no EDA (Sense 2 only).