What is contactsd on a Mac? The Contacts service
What the contactsd process does in macOS, why it can use CPU or memory, and whether you can stop it.
What is contactsd?
contactsd manages your contacts database and keeps it in sync with iCloud and other accounts.
Why is contactsd using CPU or memory?
It is busy after a large contacts sync or import, and briefly when apps look up contacts.
Can I stop contactsd?
No need. If it stays busy, check Internet Accounts for a contacts account failing to sync.
accountsd explains account sync loops.
Common questions
Is contactsd safe on a Mac?
Yes. It is part of macOS. contactsd manages your contacts database and keeps it in sync with iCloud and other accounts..
Can I quit contactsd?
No need.