PGCKit is a lightweight Objective-C framework for interacting with PostgreSQL databases. PGCKit has no dependencies (with the exception of libpq (the PostgreSQL C library) which is installed on OS X by default).
By now PGCKit has the primary task to provide an abstract layer over the concrete PostgresSQL database that is shared between running instances of cloud applications. Therefore it does not provide a high level convenience API yet.
Further documentation: