Popular for its web-accessibility and the sheer fact that any contact management system built into arguably the best email client around has a lot going for it, Gmail Contacts have a strong. Cisdem ContactsMate is a contact manager Mac that meets all the criteria. The app is full compatible with OS X 10.11 EL Capitan, macOS 10.12 Sierra and macOS 10.13 High Sierra, etc.
Efficient Address Book Free Portable lets you keep all of your contacts in one place. It also enables you to set up reminders, so you never forget a birthday again. And because this tool is completely portable, you can take it with you and use it on any computer you choose.
Organization and import options: You can import your entire contact list into this app as long as it is in the form of a comma delimited file, or you can add them manually. Once those contacts are in place, you'll have quite a few options for organizing them for easy access. For instance, you can create different groups to sort your Work and Personal contacts, and you can even have sub-groups within those groups for further clarity.
Portability: Since this is the portable version of the app, you can transfer it completely to a USB drive and take it with you wherever you go. That means you'll never be without all of your contacts, and changing computers doesn't mean you have to put all of that information together again.
Convoluted Help: The Help document that comes with this app, while extensive, isn't very clear in its descriptions. This isn't a huge drawback, since most features are clearly accessible anyway. But it could be a problem for those with less computer experience.
Efficient Address Book Free Portable is a handy tool to have at your disposal. It lets you keep all of your contact information organized the way you want to, and because you can carry it on a portable drive, you never have to worry about being without all of that information.