EXHIBIT 23.1 CONSENT OF INDEPENDENT AUDITORS We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-101685 and 333-52240) of our report dated February 7, 2003, with respect to the consolidated financial statements and schedule of Catuity, Inc. included in Catuity, Inc.'s Annual Report on Form 10-K for the year ended December 31, 2002. /s/ Ernst & Young LLP Detroit, Michigan March 27, 2003