Exhibit 23.1 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the use in this Registration Statement on Form S-1 of our report dated February 3, 1999, except as to the pooling of interests with Bright Tiger Technologies, Inc. which is as of April 12, 1999, relating to the financial statements and financial statement schedules of Allaire Corporation, which appear in such Registration Statement. We hereby consent to the use in this Registration Statement on Form S-1 of our report dated April 15, 1999, relating to the financial statements of Bright Tiger Technologies, Inc., which appear in such Registration Statement. We also consent to the reference to us under the heading "Experts" in such Registration Statement. /s/PricewaterhouseCoopers LLP PricewaterhouseCoopers LLP Boston, Massachusetts June 15, 1999