Keynote Systems (Nasdaq:KEYN), the global leader in on-demand mobile and Internet test & measurement solutions for continuously improving the online experience, will participate at the following conferences in New York City. Umang Gupta, chairman & chief executive officer, and Drew Hamer, chief financial officer, will present.

• 4^th Annual Needham Internet & Digital Media Conference
  
  Tuesday, June 9, 2009 at 8:40 a.m. ET - at the New York Palace Hotel

• UBS Global Technology and Services Conference
  
  Wednesday, June 10, 2009 at 8:30 a.m. ET at The Sheraton New York Hotel & Towers

The presentation used at the conferences will be available on Keynote’s Web site www.keynote.com in the Investor Relations section.

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 over 3,600 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®, DataPulse®, CustomerScope®, Keynote CE Rankings®, Keynote Customer Experience Rankings®, Perspective®, Keynote Red Alert®, Keynote Traffic Perspective®, Keynote WebEffective®, The Internet Performance Authority®, MyKeynote® , SIGOS®, SITE®, keynote™ The Mobile & Internet Performance Authority™, Keynote FlexUse™ are trademarks or registered trademarks of Keynote Systems, Inc. in the United States and/or other countries. All other trademarks are the property of their respective owners. © 2009 Keynote Systems, Inc.

Keynote Systems, Inc.
Dan Berkowitz, 650-403-3305 (Public Relations)
dberkowitz@keynote.com
Kirsten Chapman, 415-433-3777 (Investor Relations)
kchapman@lhai.com