Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We have issued our reports dated March 9, 2012, with respect to the consolidated financial statements included in the Annual Report of SPS Commerce, Inc. on Form 10-K for the year ended December 31, 2011. We hereby consent to the incorporation by reference of said reports in the Registration Statements of SPS Commerce, Inc. on Form S-3 (File No. 333-174026, effective June 7, 2011) and on Forms S-8 (File No. 333-179236, effective January 27, 2012, File No. 333-172073, effective February 4, 2011 and File Nos. 333-167315 and 333-167314, effective June 4, 2010).

/S/ GRANT THORNTON LLP

Minneapolis, Minnesota

March 9, 2012