Anonymous page-view and click events (page, referrer tag, timestamp) to understand which categories matter. No cookies, no cross-site tracking, no fingerprinting, no ad networks.
If you opt in to score-change notifications we store your email address and the category you watched — nothing else. Unsubscribe by replying to any email; we delete the address. We never sell or share the list.
Outbound "check price" links may carry an affiliate tag; the retailer's own privacy policy applies on their site.