Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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We consent to the incorporation by reference in Registration Statement No. 333-266168 on Form S-3 and Registration Nos. 333-263726 and 333-240143 on Form S-8 of Vertex, Inc. of our report dated March 10, 2023 relating to the consolidated financial statements, appearing in this Annual Report on Form 10-K.

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/s/ Crowe LLP

Crowe LLP

New York, New York

March 10, 2023

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