The mol­ecular dimensions of 2-ethyl­sulfanyl-7-(4-methyl­phen­yl)-4-phenyl­pyrazolo[1,5-a][1,3,5]triazine, C20H18N4S, (I), 7-(4-chloro­phen­yl)-2-ethyl­sulfanyl-4-phenyl­pyrazolo[1,5-a][1,3,5]triazine, C19H15ClN4S, (II), and 4,7-bis­(4-chloro­phen­yl)-2-(ethyl­sulfan­yl)pyrazolo[1,5-a][1,3,5]triazine, C19H14Cl2N4S, (III), show evidence for some aromatic delocalization in the pyrazole rings. The conformations adopted by the ethyl­sulfanyl substituents are different in all three compounds. There are no hydrogen bonds in any of the crystal structures, but pairs of mol­ecules in (II) and (III) are linked into centrosymmetric dimers by π-stacking inter­actions.