It is one of our goals here at Tithe.ly to make data migration as painless as possible. follow the directions below on how to export information out of your current MacOS/Apple Contacts account.
Open Contacts
Select the contacts list you wish to export
Go to File → Export→ Export as vCard
Name the file and save
If importing DIY, you will need to convert this file into CSV. There are some free online tools that can do this. One such tool is here.
After you have done this, click here to learn more on how to import that information into Elvanto!