WHOOP

WHOOP is a screenless continuous biometry wristband that measures heart rate variability (HRV), sleep, blood oxygen saturation, and effort level (Strain) 24/7. Its AI coach analyzes this data to give you a personalized recovery score each morning and a tailored recommendation: should you train hard, train lightly, or recover? As of 2025, WHOOP offers three tiers: One (baseline), Peak (with Sleep Coach and Strain Coach AI), and Life (WHOOP MG medical device with ECG and atrial fibrillation detection).

WHOOP targets serious athletes and healthcare professionals who want to manage training load based on real physiological data. The annual subscription includes the hardware with no separate price tag. The main limitation is the lack of a French interface; the app is English-only. A public API is available to developers and enterprises. No screen: everything happens on your smartphone.