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Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors
Aspen Technology Inc.:

        We consent to the use in this Amendment No. 1 to the Registration Statement on Form S-1 of our report dated September 1, 2010, with respect to the consolidated balance sheets of Aspen Technology Inc. as of June 30, 2010 and 2009, and the related consolidated statements of operations, stockholders' equity (deficit) and comprehensive income (loss) and cash flows for each of the years in the three-year period ended June 30, 2010, appearing in this prospectus, which is part of this registration statement. We also consent to the reference to us under the heading "Experts" and "Selected Financial Data" in the prospectus.

                                                                                        /s/ KPMG LLP

Boston, Massachusetts
September 15, 2010

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Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM