ResX is a free iPhone app developed by ResX LLC, designed to provide users with a platform to exchange last minute reservations at popular restaurants. Whether you have a reservation that you can no longer make or you suddenly find yourself available and in need of a reservation, ResX aims to connect users and facilitate the exchange of dining plans.

The app promises to offer the city's best plans without the hassle of extensive planning. With ResX, users can submit their unwanted reservations, allowing others to grab them and make the most of their dining experience. The app aims to create a community of diners who can benefit from each other's last-minute changes in plans.