WHOOP is a subscription fitness-wearable and app made by WHOOP, Inc., a private, venture-backed US company headquartered in Boston. WHOOP's own privacy pages state it never sells members' personal data and will only share it with others if the member asks, while separately listing routine sharing with service providers, advertising partners, and a third-party LLM partner that powers its WHOOP Coach feature. Its App Store privacy label discloses a broad set of health, contact, and usage data linked to a member's identity for advertising/marketing and product-personalization purposes, but does not declare any data category used to track users across other companies' apps. In July 2025 the FDA sent WHOOP a warning letter concluding its Blood Pressure Insights feature was an unapproved medical device -- a device-regulatory action about a specific feature, not a finding about data privacy practices. No FTC, state-AG, or other privacy-specific enforcement action or breach was found via primary sources during this review.