Hopper is a travel booking app that helps users find and book flights and hotels at what it claims are the best prices. It uses its own proprietary algorithm to predict price fluctuations, allowing users to see if it[SQ]s a good time to book or to wait for a better deal. It offers price tracking, fare alerts, and booking capabilities for flights and hotels. Essentially, it[SQ]s a price comparison and prediction tool combined with a booking platform.