Certain examples relate to a method of making an antireflective (AR) coating supported by a glass substrate. The anti-reflection coating may include porous metal oxide(s) and/or silica, and may be produced using a sol-gel process. The pores may be formed and/or tuned in each layer respectively in such a manner that the coating ultimately may comprise a porous matrix, graded with respect to porosity. The gradient in porosity may be achieved by forming first and second layers using one or more of (a) nanoparticles of different shapes and/or sizes, (b) porous nanoparticles having varying pore sizes, and/or (c) compounds/materials of various types, sizes, and shapes that may ultimately be removed from the coating post-deposition (e.g., carbon structures, micelles, etc., removed through combustion, calcination, ozonolysis, solvent-extraction, etc.), leaving spaces where the removed materials were previously located.