Whoop is a popular fitness tracker that uses a subscription-based model, which has frustrated many users. Unlike other trackers, the device is only usable with a monthly or annual payment, making it costly over time. Users cannot access their data or use the tracker if they stop paying, leading to complaints about feeling locked in. While Whoop offers advanced health insights and recovery tracking, many believe the high cost is not justified. Comparisons with one-time purchase devices like Fitbit or Apple Watch highlight the pricing gap. To attract more users, Whoop may need to offer more flexible and affordable options.