Amazfit Helio Strap
Amazfit Helio Strap is an armband from 2025, sitting in the budget band at an indicative $99.
It reads 16 of the 33 signals this comparison tracks. 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, an optical blood oxygen sensor, a skin temperature sensor and an accelerometer. Blood oxygen is measured through the night, not continuously through the day.
Its 10 days per charge are the 4th longest of the 11 devices of its kind here that publish a figure. Rated 5ATM, fine for swimming. It weighs 20 g. No subscription is required.
Screen-free, subscription-free optical HR band (wrist/upper-arm); BioCharge readiness, VO2max; no GPS/ECG.
Key specs
What it tracks
Heart & vitals
Sleep
Activity
Fitness
Buying for battery life? See every device ranked by battery life
Your wearable's data, read against your own normal
MyBodyAI reads COROS, Garmin, Oura, Polar and Withings by logging in, and Fitbit and Pixel Watch through Google Health. Older Garmin history comes from a data export. It learns how you usually sleep and what your resting heart rate usually is, and every day shows where you stand against yourself: recovery, sleep, load and immune scores, a biological age estimate and early warnings. Optional, and separate from this comparison.
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