The AMAZFIT HELIO STRAP bracelet offers the same Whoop benefits of tracking sleep, activities, and various sports with very high accuracy. I tested it with Whoop, and the results were very accurate for both. The only difference is that you pay only once and do not need a subscription. The Amazfit sensor has been installed on an adapter that was 3D printed to fit Whoop bracelets. In short, the external appearance is the same as Whoop, you get the same benefits and accuracy, and you pay only once and do not need any subscriptions. The bracelet cost me about 1500 SAR, including the price of the Amazfit Helio sensor, the adapter design and printing, and the purchase of the Whoop bracelet. Contact via private message or WhatsApp.