iContacts: Contact Group Tool

iContacts: Contact Group Tool helps you organize contacts into groups and manage them efficiently. It supports real-time synchronization with your contacts data, multiple selection methods, and bulk actions such as deleting or moving contacts between groups. Features include group messaging and group emails, advanced search by name or phone (including Korean initials), and simultaneous support for iCloud and CardDAV.

Security and ease of use are emphasized: the tool leverages your system's contact data securely, and is free to use with no subscription required. It also notes permissions and compatibility considerations to ensure smooth operation.