In the context of the explosion of genomic data, the functional annotation of sulfatases is thus particularly prone to flaws and misinterpretations. A classification system allowing for a better prediction of substrate specificity and for setting the limit of functional annotations was therefore urgently needed for sulfatases. SulfAtlas describes the family and sub-families of structurally-related sulfatases. Sub-families are created based on phylogenetic analyses and essentially correspond to different substrate specificities. meer