What about iOS?

How to (sort of) get Smart Groups on iOS devices

For reasons known only to Apple, Smart Groups don’t sync to iOS, and you can’t create Smart Groups on an iPhone, iPod touch or iPad, either. A workaround for the former problem is to copy items from a Smart Group into a regular one on your Mac, which will sync to iCloud and be accessible on iOS. However, there is a way to make and edit Smart Groups on iOS: go to iCloud.com in Safari, tap the Share icon, choose Request Desktop Site, then sign in and tap Contacts. Your iPhone must be in portrait orientation to see the + at the bottom of the sidebar.