iContacst X is a contacts app that allows you to view and edit contacts and contact groups.
The following three are the biggest features of this app.
・"Group tab", "Contact tab", "Star tab" 3 types of sliding tab display,
・Index bar that can display up to the 6th character,
・You can freely customize the theme color.

Functional overview:
・ Group management with 200 types of group icons
・ Index bar that can display up to 6 characters
・ Theme color that can be freely selected
・ Group mail function (save function of affiliated text)
・ Call confirmation function
・ Default prefix addition function