Press Room: 2009

Keynote Systems to Announce Fiscal 2009 Second Quarter Financial Results on April 28th

SAN MATEO, Calif., — April 07, 2009 — Keynote Systems (Nasdaq: KEYN), the global leader in on-demand mobile and Internet test & measurement solutions for continuously improving the online experience, intends to announce its fiscal 2009 second quarter financial results for the period ended March 31, 2009 after the market closes on Tuesday, April 28, 2009. Keynote will host an earnings conference call at 2:00 P.M. Pacific (5:00 P.M. Eastern).

To access the call in the U.S., please dial (866) 271-6228, and for international callers dial (973) 638-3423 approximately 10 minutes prior to the start of the conference call. The conference ID is #93909452. The conference call will also be broadcast live over the Internet and available for replay for 90 days at www.keynote.com. In addition, a replay of the call will be available via telephone for five business days, beginning two hours after the call. To listen to the telephone replay in the U.S., please dial (800) 642-1687, and for international callers, dial (706) 645-9291. Enter access code 93909452.

About Keynote

Keynote Systems (Nasdaq “KEYN”) is the global leader in on-demand test & measurement solutions for continuously improving the online experience. For over a decade, Keynote has been providing measurement data and testing capabilities that allow companies to understand and improve their customers’ online and mobile experience. Keynote has four test and measurement businesses: Web performance, mobile quality, streaming & VoIP, and customer experience/UX.

Known as The Mobile and Internet Performance Authority™, Keynote has a market-leading infrastructure of 2,600 measurement computers and mobile devices in over 240 locations around the world. Keynote’s 2,800 customers represent top Internet and mobile companies including American Express, Dell, Disney, eBay, E*TRADE, Expedia, Microsoft, SonyEricsson, Sprint, T-Mobile, Verizon, Vodafone and YouTube.

Keynote Systems, Inc. is headquartered in San Mateo, California and can be reached at www.keynote.com or by phone in the U.S. at 1-800-KEYNOTE.

Keynote, The Internet Performance Authority, Perspective and Customer Experience Rankings are registered trademarks and The Mobile and Internet Performance Authority and True Experience are trademarks of Keynote Systems, Inc. Other trademarks are the property of their respective owners. © 2008 Keynote Systems, Inc.

Editorial Contacts:

Dan Berkowitz, Keynote Systems, (650) 403-3305, dan.berkowitz@keynote.com

Kirsten Chapman, Keynote Systems, Inc., (415) 433-3777, kchapman@lhai.com