This is an innovative free access program (http://www.lexicon.unisi.it/public) for the construction of customized textual corpora and the linguistic analysis created by Luigi Tessarolo based on a project by F. Stella. The texts, acquired through a simple and intuitive procedure, can be queried individually or inserted in corpora, according to various functions: it is possible to elaborate personal grammatical tables, obtain the frequencies, the coollocates (that is the words that occur several times in a text displayed in the their context), the clusters (sequences of consecutive words) and above all the overlapping quotas of the lexicon of two or more works or authors or corpora can be compared. The results of the analyzes are always presented in the form of a table or a graph.