It is the purpose of this paper to represent an analysis of four variants of critical philosophy of science: the constructivistic methodology, the reflexion upon science from the viewpoint of the critical theory of society, the ‘social natural science’ as a further development of the finalization conception, and the projective philosophy of science. Special attention is paid to the comparison of these variants. Some points of convergence as well as of divergence among them are revealed. A common shortcoming is indicated.