UCLCHEM is a gas-grain chemical code written in Modern Fortran. It propagates the abundances of chemical species through a network of user-defined reactions according to the physical conditions of the gas. Included in the repository is MakeRates, a python script to combine a species list, UMIST reaction file and user-defined reaction file into a consistent network with all files required by UCLCHEM.

UCLCHEM is freely available for use and/or modification for any astrochemical use. Please reference our release paper if UCLCHEM is used for work in a publication and feel free to contact us with suggestions, questions or to ask for advice using the code.