Very good

FullContact gets the job done. No complicated manuals to read. Just start using it! Input of contacts is easy. And the app automagically imports contacts from all your other address books. The developer is serious about releasing regular updates. Abandonware this is not. The user interface is clean and modern. I enjoy using this app for my contacts. Plus, I get to tag all my contacts, which is cool!

Packer2020 about Contacts+ | Address Book, v4.11.0