Ecleti has announced Private Contact 3.5.1 for the Mac. It’s an update of the app for managing an always-encrypted address books. Version 3.5.1 is a maintenance upgrade with performance tweaks and bug fixes.
Private Contact 3.3 requires macOS 10.10 or higher. It costs $9.99 and is available at the product website (http://www.ecleti.com/osx/privatecontact/) and the Mac App Store.