It syncs automatically with your Outlook, Gmail, and iCloud accounts.

Efficcess is a full-featured personal information manager (PIM). While they offer a paid "Pro" version, the free version serves as an excellent standalone address book for Windows 10.

One of the best features is the ability to print your contact list in a clean, readable format—perfect for physical backups. 4. Best for Privacy: Efficcess (Free Version)

Open the .exe file and follow the Windows 10 installation prompts.