King's Cross is an iPhone application developed by Andreas Kienle in the category of Education & Reference. It is a program designed to help chess players keep track of their chess openings and improve their gameplay. With King's Cross, users can consolidate their repertoire in one place and synchronize it across their devices.

The main features of King's Cross include the ability to explore new variations, practice openings, and analyze training over time. The app aims to help users gain confidence in their openings and enhance their chess skills.

It is important to note that King's Cross does not come with pre-installed openings. Instead, users can build their own repertoire by entering the variations they consider good. For additional openings and to remove ads, users have the option to subscribe to King's Cross Premium.

If users choose to subscribe to King's Cross Premium, the purchase will be charged to their iTunes account. The subscription will be auto-renewed 24 hours prior to its expiration, and users can manage it from the User Settings in iTunes. They will also have the ability to cancel the auto-renewing subscription from there.