Unfortunately SQL Compare does not yet support SQL Server 2014.
http://documentation.red-gate.com/displ ... quirements
We tend not to support the CTPs, we typically wait for the final release and then put out a build that works with the RTM version.
I have submitted a feature request for early support of SQL 2014 on your behalf, the reference for this request is SC-6630.
I am unable to provide a definitive timeline for when SQL Compare will support SQL Server 2014.
I recommend that you submit a request for this feature on the SQL Compare User Voice forum via this link - http://redgate.uservoice.com/forums/141 ... uggestions
The SQL Compare Development Team and Product Manager actively monitor this forum. The more votes a feature request receives from other SQL Compare users in this forum increases the chances of the feature being included in a future version of the product.