EXHIBIT 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-120160 and 333-117405) of Greenfield Online, Inc., of our report dated March 30, 2005 relating to the consolidated financial statements, which appear in this Form 10-K. We also consent to the incorporation by reference of our report dated March 30, 2005 relating to the financial statement schedule, which appears in this Form 10-K. /s/ PricewaterhouseCoopers LLP Stamford, Connecticut March 30, 2005