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The title compounds, C13H13N3O2S·0.5H2O, (I), and C17H14ClN3OS, (II), are hydrazinecarbothioamide derivatives. Compound (I) crystallizes with two independent molecules (A and B) and a water molecule of crystallization in the asymmetric unit. The chromene moiety is essentially planar in molecules A and B, with maximum deviations of 0.028 (3) and 0.016 (3) Å, respectively, for the carbonyl C atoms. In (II), the pyran ring of the chromene moiety adopts a screw-boat conformation and the phenyl ring is inclined by 61.18 (9)° to its mean plane. In the crystal of (I), bifurcated N—H...O and C—H...O hydrogen bonds link the two independent molecules forming A–B dimers with two R21(6) ring motifs, and R22(10) and R22(14) ring motifs. In addition to these, the water molecule forms tetrafurcated hydrogen bonds which alternately generate R44(12) and R66(22) graph-set ring motifs. There are also π–π [inter-centroid distances = 3.5648 (14) and 3.6825 (15) Å] interactions present, leading to the formation of columns along the c-axis direction. In the crystal of (II), molecules are linked by pairs of N—H...S hydrogen bonds, forming inversion dimers with an R22(8) ring motif. The dimers are linked by C—H...π interactions, forming ribbons lying parallel to (210).