Amazfit Active 2

Amazfit Active 2 is a watch from 2025, sitting in the budget band at an indicative $99.

It reads 18 of the 33 signals this comparison tracks. Full coverage of activity. Nothing at all from body composition.

By sensor class: 10 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. Blood oxygen is measured through the night, not continuously through the day.

Its 10 days per charge are the 57th 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, fine for swimming. It weighs 29.5 g. On top of the tracking it also handles offline maps. Case size 44mm. No subscription is required.

Sub-$100 watch w/ bezel-electrode ECG/AFib, GPS maps, readiness.