CHISEL is an algorithm to infer allele- and haplotype-specififc copy numbers in individual cells from low-coverage single-cell DNA sequencing data. Specifically, the current implementation of CHISEL has been designed to be diretly applied to ultra-low coverage single-cell DNA sequencing data from 10X Genomics CNV solution, however CHISEL will be adapted to the data generated by any other available technology (e.g. DLP+).