Keynote^® Systems (NASDAQ: KEYN), the global leader in Internet and mobile cloud testing & monitoring, intends to participate in the following investor conferences in May. Presenting from management will be Umang Gupta, chairman and CEO; and Curtis Smith, chief financial officer.

• Jefferies 2012 Global Technology, Media & Telecom Conference
  Wednesday, May 9^th in New York City
• 11^th Annual JMP Securities Research Conference
  Wednesday, May 16^th at The Ritz-Carlton in San Francisco
• 13^th Annual B. Riley & Co. Investor Conference
  Tuesday, May 22^nd at the Loews Santa Monica Beach Hotel

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

About Keynote Systems

Keynote^® Systems, Inc., (NASDAQ:KEYN) is the global leader in Internet and mobile cloud testing and monitoring. Keynote maintains the world’s largest on-demand performance monitoring and testing infrastructure for Web and mobile sites comprised of over 7,000 measurement computers and mobile devices in over 275 locations around the world that enable companies to continuously improve the online and mobile experience. Known as ‘The Mobile and Internet Performance Authority™,’ Keynote offers three market-leading product platforms:

Keynote Perspective^® provides on-demand performance monitoring for enterprise Web and mobile sites including online portals, e-commerce sites and B2B sites. Over 2,000 customers rely on Keynote Perspective services to know precisely how their websites, content, and applications perform on actual browsers, networks, and mobile devices.

Keynote DeviceAnywhere^™ is an enterprise-class, cloud-based, mobile application lifecycle management (ALM) testing & quality assurance platform. It is used by over 1,000 mobile developers and enterprises to deliver mobile applications, content and services faster while reducing downtime and testing costs.

Keynote SIGOS offers active end-to-end Quality of Service (QoS) testing and monitoring solutions for mobile, fixed and VoIP communications. Its SITE and Global Roamer products are used by over 200 network operators, content providers, carriers and regulators in over 100 countries worldwide.

Keynote’s 4,000 customers represent top Internet and mobile companies and include American Express, AT&T, Disney, eBay, E*TRADE, Expedia, Google, Microsoft, SonyEricsson, T-Mobile and Vodafone. Keynote Systems is headquartered in San Mateo, California and can be reached at http://www.keynote.com/ or by phone in the U.S. at 1-800-KEYNOTE.

The trademarks or registered trademarks of Keynote Systems, Inc. in the United States and other countries include Keynote^®, Data Pulse^®, CustomerScope^®, Customer Experience Rankings^®, Perspective^®, Keynote Red Alert^®, WebEffective^®, The Internet Performance Authority^®, MyKeynote^®, SIGOS^®, SITE^®, The Mobile & Internet Performance Authority^®, FlexUse^®, DeviceAnywhere^® DemoAnywhere^®, DeviceAnywhere Proof Center^®, DeviceAnywhere Test Center^®, MonitorAnywhere^®, and all other related trademarks, trade names, logos, characters, design and trade dress and may not be used without written permission. All other trademarks are the property of their respective owners. ^© 2012 Keynote Systems, Inc.