Is sync.blue® an independent, central address book?

Yes and no. In detail:

No, because sync.blue® does not have a central web interface for direct live management of central contacts offers. Why? Because any Goupware (Google Contacts, Microsoft 365, Apple iCloud,...) or any CRM (HubSpot, weclapp,..) does a better job regarding contact management.

Yes, because you can use a single existing groupware or CRM account, to create this account with professional software using sync.blue® into any number of identical or different destinations.

The recommended practice is to NOT:

• sync.blue® --> Target A
• sync.blue® --> Target B
• ...

But the recommended approach IS:

• Groupware / CRM --> Target A
• Groupware / CRM --> Target B

In addition, with sync.blue® it is possible to combine contacts from a wide variety of sources merge a single target and then merge it into any number of other targets to sync.