GLOMAP is a flexible aerosol microphysics model. There are two GLOMAP flavours: GLOMAP-bin is a comprehensive sectional (bin) model and GLOMAP-mode is a faster modal version. GLOMAP-bin was developed as a full-complexity model able to calculate the details of the aerosol number size distribution on a global scale. GLOMAP-mode was developed later as a faster code for inclusion in climate and weather models where computational efficiency is paramount.