PACT (Planetary Atmosphere Chemistry and Temperature) couples thermal structure and chemistry in the vertical (1D) direction to model planetary and exoplanet atmospheres. It computes radiative–convective temperature profiles while integrating a non‑equilibrium chemical network that includes kinetics, photochemical processes, and vertical mixing, yielding altitude‑dependent abundances for many gas‑phase species. Given planetary and atmospheric parameters and a chemical network, the code returns self‑consistent vertical profiles of temperature and composition for further analysis.