flanders is an R package designed to seamlessly convert finemapping output files from the nf-flanders pipeline into a unified AnnData object and facilitate colocalization analysis. The package provides functions to: - Convert multiple *finemap.rds files into a single AnnData object with credible set metadata. - Generate an input table (coloc_input) for colocalization testing. - Run pairwise colocalization tests, with minimal runtime overhead (typically 5–10 tests per second on standard hardware).