HaploReg is a tool for exploring annotations of the noncoding genome at variants on haplotype blocks, such as candidate regulatory SNPs at disease-associated loci. It brings together data from chromatin-mapping and comparative-genomics studies. Researchers can enter common variants and see whether they fall in a highly conserved region, disrupt a regulatory motif or are associated with a regulatory element in a particular cell type. It provides the same information for common variants that tend to be inherited along with the ones entered. Registration not required.