The asymmetric unit in the title thiourea derivative, C13H19N3S, comprises three independent molecules (A, B and C). The thiourea groups are superimposable for the three molecules, but there are significant conformational differences. Molecules A and B are approximate mirror images of each other, and molecule C has an intermediate conformation. The dihedral angles between the thiourea groups and the phenyl rings are 52.10 (5), 63.29 (5) and 66.46 (6)° in molecules A, B and C, respectively. Each independent molecule self-associates into a supramolecular chain along [100] via N—H⋯S hydrogen bonds. Molecules of A and B assemble into layers four molecules thick in the ac plane via C—H⋯S and C—H⋯π interactions. Molecules of C self-assemble into layers in the ac plane via C—H⋯S interactions. The layers stack along the b axis with no specific interactions between them.