Booking.com

Booking.com is the largest hotel booking platform by inventory, covering hotels, apartments and guesthouses in most countries.

Its practical advantage is breadth plus free cancellation on much of that inventory, which makes it usable for provisional plans — book now, decide later, cancel without cost.

Prices shown are not always final: taxes and fees vary by country and property, so the total at checkout is the number to compare rather than the headline rate.