Press Room: 2004

Keynote to Announce Second Quarter Fiscal Year 2004 Financial Results in Conference Call on April 26, 2004

SAN MATEO, California — April 5, 2004 — Keynote Systems, Inc. (Nasdaq:KEYN) will hold its regularly scheduled conference call on Monday, April 26, 2004, at 2:00 p.m. (PT) / 5:00 p.m. (ET) to announce financial results for its second quarter fiscal year 2004 ended March 31, 2004.

Keynote’s financial results will be released over Business Wire after the close of market, approximately 1:00 p.m. (PT) on Monday, April 26, 2004. The press release will be available on Keynote’s Web site at http://www.keynote.com/ at approximately the same time.

To listen to the live conference call, please contact Erin Kasenchak at (650) 403-3314, or erin.kasenchak@keynote.com. The webcast of the call will be available at the Investor Relations section of Keynote’s Web site at http://www.keynote.com/ under ‘Investors.’

Playback of the conference will be available at 4:00 p.m. (PT) on April 26, 2004, through 9:00 p.m. (PT) on April 29, 2004. To access the replay, dial (800) 642-1687. The passcode is 6391384. Keynote’s quarterly conference calls are also archived on the company’s Web site at http://www.keynote.com/. To access, select ‘Audio Archives’ from the ‘Investors’ section.

About Keynote

Founded in 1995, Keynote Systems, Inc., (Nasdaq “KEYN”), The Internet Performance Authority®, is the worldwide leader in Web performance measurement and management services that improve the quality of e-business. Keynote’s services enable corporate enterprises to monitor, benchmark, test, diagnose and optimize their e-business systems both inside and outside the firewall. Approximately 2,200 corporate IT departments and 17,000 individual subscribers rely on the company's easy-to-use and cost-effective services to increase revenues and reduce downtime costs, without requiring additional complex and costly software implementations.

The Keynote brand is recognized as The Internet Performance Authority because of the large number of Internet performance measurements its global infrastructure of over 1,600 measurement computers in 50 cities worldwide captures and stores on a daily basis (over 40 million at last count); frequent citations in the mass media regarding Web site and Internet performance; and its broad and growing range of market-leading Internet performance indices for various vertical markets. (http://www.keynote.com/solutions/solutions_pi_index.html)

Keynote Systems, Inc. is headquartered in San Mateo, California and can be reached at http://www.keynote.com/ or by phone in the U.S. at 650-403-2400.

Keynote, The Internet Performance Authority and Perspective are registered trademarks of Keynote Systems, Inc. Other trademarks are the property of their respective owners. © 2004 Keynote Systems, Inc.

Public Relations Contact:

Dan Berkowitz, Keynote Systems, Inc., (650) 403-3305, dberkowitz@keynote.com

Investor Relations Contact:

Erin KasenchakErin Kasenchak, Keynote Systems, (650) 403-3314, erin.kasenchak@keynote.com/P>