Why manually deleted contacts are not deleted in other apps?

For your own security, contacts deleted manually, e.g. in the source app, are deliberately not deleted in the target app.

This is the only way sync.blue® ensures even more data security because contacts remain in the other apps even after accidental deletion. 

If contacts were deleted in the source, it is technically correct that the originally recognized contact count is still preserved for the connector.

Tip: instead of deleting a contact completely, replace its data fields with the character "-", for example. ". This way, sync.blue® will also overwrite these values in all connected apps.