Amazfit Helio Strap: 6-Month Scientific Review
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The Amazfit Helio Strap has become one of the most popular Whoop Strap alternatives of 2025. It's much cheaper with no subscription, leading many to switch from Whoop. Testing heart rate tracking and sleep stage tracking performance under different circumstances to see if it's as good or better than Whoop.
Rob is a post-doctoral scientist specializing in biological data analysis. Reviewed about 2 months of data with the special edition Helio Strap; sensor and build identical to normal Helio Strap, only strap differs. Worn on biceps for long-term testing as wrists needed for other devices.
Overview compares Amazfit Helio Strap to other devices like smartwatches, Whoop Strap, Polar Loop. Horizontal axis: agreement with reference device (correlation, higher better). Vertical axis: devices ordered worst to best. Better devices top right.
Showed all 2025 devices tested. Amazfit Helio Strap (biceps) one of the best, comparable to Apple Watches, Huawei Watch 5, Huawei Watch Fit models, Amazfit Balance 2. Wrist testing also good. Excellent for indoor cycling (spinning).
Spinning session: Polar H10 reference (blue-green) vs Helio Strap (red) shows near-perfect agreement. Interval session: perfect except minor low HR deviations. All spinning sessions similar, high correlation.
Recommends Runner app for runs (plans, custom plans, guidance; affiliate link for 2-week trial). Amazfit Helio Strap (biceps) super high correlation, outperforms most devices. Wrist version less good. Recommends for HR tracking.
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