Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the reference to our firm under the caption “Experts” in the Registration Statement (FormS-1) and related Prospectus of Altair Engineering Inc. for the registration of shares of its common stock and to the incorporation by reference therein of our report dated March 21, 2018, with respect to the consolidated financial statements and schedule of Altair Engineering Inc. included in its Annual Report (Form10-K) for the year ended December 31, 2017, filed with the Securities and Exchange Commission.
/s/ ERNST & YOUNG LLP
Detroit, Michigan
June 4, 2018