Tools & Gear
The only device I use myself is WHOOP. Everything else on this page is assessed from manufacturer data and published reviews — not from personal use. Methodology
In daily use
WHOOP (4.0, now 5.0)
Worn continuously since February 2024. All first-party HRV, sleep and recovery data on this site comes from this tracking.
Assessed, not tested first-hand
Smart rings (Oura, RingConn, Ultrahuman, Samsung, Luna)
Not worn by me. Assessed from manufacturer specifications, prices and published reviews.
Glucose sensors (CGM)
Not worn by me. FreeStyle Libre 3 / 3 Plus sensors are subject to an FDA Class I recall; if you use one, check your lot with Abbott's lot checker (freestylecheck.com; in Germany freestylecheck.com/de-de, plus freestyleconfirm.com/de-de for the separate falsely-high issue on 3 Plus).
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