Priceline is a hotel and flight comparison app that allows you to ‘bid’ for a hotel by naming your own price or choose a mystery hotel by amenities, location and stars. Whether the price for either of these is cheaper than normal or other comparison sites is hard to say, as you don't get to review the hotel before purchase, but they have potential. Flight comparison is more basic than other sites such as Skyscanner and the bid option doesn't work for all cities and dates.