Keymodule Ltd. is a chemoinformatics software company that specializes in the development of toolkits and applications for chemical and pharmaceutical research. It is based in Leeds, England, and was founded in 1993. KeyModule develops software that is focussed on Optical Structure Recognition (OSR), de novo structure-based ligand design, and fragment-based drug design.

CLiDE is one of the popular products from KeyModule and is used for Optical Structure Recognition (OSR). The development of CLiDE started in 1991 as a research project at the University of Leeds. In 2006, the development of CLiDE was handed to Keymodule Ltd. CLiDE is currently one of the best available OSR tools in the market with high accuracy and automatic correction of OSR errors.