Reaction Mechanism Generator (RMG) is an open-source software package that automatically builds detailed kinetic models by proposing elementary reactions and estimating chemical properties (physical, thermochemical, kinetic, solvation, etc.) using a database of reaction templates, thermokinetic data, and estimation methods. These chemical properties are first sought in a database of known parameters, but are more commonly estimated using hierarchical decision trees. Thermochemical parameters (∆ f H