In the title compound, C₁₇H₁₇N₅, the dihedral angle between the 1H-pyrazolo­[3,4-b]pyridine ring system (r.m.s. deviation = 0.001 Å) and the attached phenyl group is 2.56 (6)°. The propyl­amino side chain has a contorted conformation [C_ar—N—C—C = −77.97 (16)° and N—C—C—C = −57.37 (17)°]. An intra­molecular C—H⋯N inter­action closes an S(6) ring. In the crystal, inversion dimers linked by pairs of N—H⋯N hydrogen bonds generate R ₂ ²(12) loops. Aromatic π–π stacking inter­actions [centroid–centroid distance = 3.5726 (8) Å] are also observed.