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Compare hotel prices on Booking.com, Expedia & Hotels.com. Lower listed rates flagged honestly. Free price-drop alerts by email. Underbook double-checks the hotel you're already shopping for. When you're on a hotel page at Booking.com, Expedia, or Hotels.com, Underbook quietly checks other booking sites for the same stay and tells you if there's a lower listed rate — without you leaving the page. HONEST BY DESIGN We don't pretend an unfamiliar rate is the exact same room. When we can't confirm the room type and cancellation terms match, we say so plainly and show you both, side by side, so you can decide. No fake guarantees, no invented savings. HOW IT WORKS 1. Shop hotels like you always do — nothing to change. 2. In the background, Underbook checks other booking sites for the same dates. 3. If it's cheaper, we show the room and cancellation terms to compare. You always book on the site you choose. PRIVATE BY DEFAULT • The check runs in your own browser — there's no Underbook server collecting your activity. • We never see, store, or transmit your payment details. • We don't sell your data. There's nothing collected to sell. WHAT UNDERBOOK IS NOT We don't book for you and we never hold your card. We surface a lower listed rate and the details you need to verify it — the decision and the booking stay with you. Free during early access. Questions: hi@underbook.co · Privacy: https://underbook.co/privacy