The screening approach employed by this work allowed the shortlisting of photocatalytically active COFs based on a cost-effective calculation of DFT-based descriptors. We selected 13 COFs as prospective photocatalysts for OWS after screening the database for alignment to redox potentials, visible light absorption, charge separation, and charge-carrier mobility descriptors. The list of selected COFs for HER contains the series of N x -COF (x=0-3) already studied experimentally for this purpose. Interestingly, our approach can seamlessly be extended to filter candidates for any desired pair of photo-redox reactions.