Callstay is an accommodation booking service that helps travelers find and reserve stays online or by phone. Customers can search hotels worldwide using live rates for their travel dates, compare available properties, and filter results by preferences such as pet-friendly rooms, pools, accessibility, and free parking. Bookings can be completed online in about a minute, or travelers can call Callstay for assistance with reservations, group blocks, long stays, and other special requests.

The service highlights practical booking options, including rates payable at the property on many reservations, often without a deposit. It also offers monthly and weekly rates, room blocks for groups where each guest can book individually, and accessible-room requests confirmed with the property. Callstay states that it does not add a markup to room rates and that prices are shown live for selected dates. Its listings span 64,000 destinations and 2.6 million properties, with options across the United States and international destinations including Italy, the United Kingdom, Greece, and the United Arab Emirates.