Contact Groupist is a minimalist utility for creating and maintaining lists of contacts. The lists will appear in the iOS, macOS and iCloud Contacts apps.
Contact lists can be used (among other things) in conjunction with your iPhones Do Not Disturb feature; see "Allow Calls From" in the Do Not Disturb section of the Settings app.
Contact Groupist is intended primarily for users whose default Contacts account is either local to their iOS device, or in iCloud. Not all Internet accounts support contact lists.
Feedback is welcome: email [email protected]