Exhibit 23.1
CONSENT OF RSM US LLP
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in the Registration Statements on FormS-8 (Nos.333-223833, and333-221312) of Altair Engineering Inc. of our report dated December 13, 2018, relating to the consolidated financial statements of Datawatch Corporation, appearing in this Current Report on Form8-K/A.
/s/ RSM US LLP
Boston, Massachusetts
February 22, 2019