A Coradine Account is an in-app account system that allows you to use your LogTen subscription on multiple devices. The Coradine Account is separate from and does not need to be the same email address as your AppleID /iCloud account. You can have one email as your Apple ID and a different email for your Coradine account.
Starting in LogTen 2023.4 Lightning, your logbook data will be connected through LogTen servers to your Coradine account. This means your irreplaceable flying life will be backed up automatically