Google Fitbit Air

Fitbit Google Fitbit Air is an armband from 2026, sitting in the budget band at an indicative $99.

It reads 17 of the 33 signals this comparison tracks. Nothing at all from body composition. Rarer readings it does take: AFib detection and 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 and an accelerometer. It screens for atrial fibrillation. Those are screening features, not a diagnosis. Blood oxygen is measured through the night, not continuously through the day.

Its 7 days per charge are the 8th longest of the 11 devices of its kind here that publish a figure. Rated 5ATM / 50m, fine for swimming. It weighs 12 g. Dimensions 34.9 x 17 x 8.3 mm. No subscription is required.

Screen-free strap launched May 2026 against WHOOP. Background atrial-fibrillation notifications only, no on-demand ECG. No EDA sensor, so no stress score.