Our Take
The WHOOP 4.0 is a screenless, subscription-based health and fitness tracker aimed at serious athletes and recovery-focused individuals. It monitors strain, sleep, and recovery around the clock via a slim wrist-worn sensor. Positioned at the premium end of the wearables market, it competes with Garmin and Oura but takes a distinctly data-heavy, coaching-led approach.
Key Features
Continuous heart rate, heart rate variability (HRV), skin temperature, and blood oxygen monitoring
Proprietary Recovery Score calculated each morning, drawing on sleep quality and HRV trends
Strain Coach provides a daily exertion target based on your recovery status
Sleep Coach offers personalised sleep duration recommendations and tracks sleep stages
Screenless, buttonless design with no display — all data accessed via the companion app
Waterproof to 10 ATM, suitable for swimming and showering
Our Verdict
Best suited to dedicated athletes, gym regulars, or anyone genuinely invested in understanding recovery and sleep rather than just counting steps. If you train consistently and want actionable data to guide load management, it earns its cost. Casual users or those wanting GPS and smart features should look at Garmin or Apple Watch instead.