Google Pixel Watch 4

Fitbit Google Pixel Watch 4 is a watch from 2025, sitting in the flagship band at an indicative $349.

It reads 21 of the 33 signals this comparison tracks. Full coverage of activity. Nothing at all from body composition. Rarer readings it does take: AFib detection, ECG recording and sleep efficiency.

By sensor class: 2 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, ECG electrodes, an optical blood oxygen sensor, a skin temperature sensor, a GPS receiver, a barometer and an accelerometer. It records an ECG and screens for atrial fibrillation. Those are screening features, not a diagnosis. Blood oxygen is measured through the night, not continuously through the day.

Its 2 days per charge are the 74th longest of the 76 devices of its kind here that publish a figure. The AMOLED screen can stay always on. Multi-band GPS. Rated 5ATM + IP68, fine for swimming. It weighs 31 g. On top of the tracking it also handles music on the device, contactless payments, its own LTE connection and offline maps. Case size 41mm & 45mm. No subscription is required.

October 2025 successor to Pixel Watch 3. No new health signal, the gains are dual-band GPS, a brighter domed display, longer battery and satellite SOS. Android only.