How to sync contacts between more than two apps?

Concept A) One source - one destination

Many users synchronize exactly two apps (e.g. Microsoft 365 + Google) with sync.blue®. Here the concept is simple: only one connection is created, the has exactly one source and one destination.

Concept B) One source - multiple destinations

However, if the contacts between three or more apps are to be synchronized with sync.blue® become, a different concept is needed. Here an app should be set as "master", i.e. as a sync source. With three apps, two sync.blue® are then seen Connections set up:

• Connection 1: App 1 (your "master") --> App 2
• Connection 2: App 1 --> App 3