Jay Freeman

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Jay Freeman
Nationality American
Other names "saurik" (Internet nickname)
Alma mater College of Creative Studies, University of California, Santa Barbara
Occupation Software engineer, entrepreneur
Website http://www.saurik.com

Jay Freeman (also known as "saurik") is an American businessman and software developer. He is known for creating the Cydia software application and related software for jailbroken iOS. Jailbroken iOS is Apple's iOS operating system modified to allow installation and customization of software outside Apple's App Store system.

Education and early work[edit]

Freeman studied computer science and graduated from the College of Creative Studies at the University of California, Santa Barbara.[1] In 2009 he was a doctoral student in computer science at UCSB.[2]

He built Anakrino, a decompiler for .NET available in 2002.[3] He co-authored a paper published in 2005 about a "Java runtime event specification and monitoring library."[4] He has worked with Brian Fox on freelance projects.[5]



In February 2008, Freeman released the initial version of Cydia, a software distribution and installation tool for jailbroken iOS.[6] In May 2009, he added a store system to Cydia to allow developers to sell products.[7] In September 2010, his company (SaurikIT, LLC) announced that it had acquired Rock Your Phone, Inc. (makers of Rock.app). SaurikIT and Rock Your Phone were the two largest providers of third party apps.[8]

He has published tools for developers making software for jailbroken iOS. He made Cydia Substrate for iOS, a framework that developers use to help them modify iOS with extensions.[9] He also made Cycript, a tool that developers use to inspect and modify applications on iOS and OS X.[10]

He has developed software extensions for jailbroken iOS users to add features to iOS, including Apple File Conduit 2,[11] Cycorder,[12] CyDialer,[13] Cydget,[13] Cyntact,[14] Cyueue,[15] Five Icon Dock, Veency,[16] and WinterBoard.[17] He has also released Cydia Impactor for jailbroken iOS, a tool for removing personal data and "unjailbreaking" the device while preserving the iOS version.[18]

He is a member of the iPhone Dev Team group, which has developed jailbreaks for iOS.[19]


Freeman has also done software development and security research on the Android operating system. In 2008, he ported Debian for use on an Android phone.[20] In April 2013, he built an implementation of a root (jailbreak) for Google Glass[21] and published an analysis of the ramifications of rooting Google Glass.[22] In May 2013, he published a version of Cydia Substrate for Android.[23] In July 2013, he published an analysis and implementation of "Master Key" vulnerabilities for Android.[24]


Freeman has been an advocate for Isla Vista, California (next to UCSB) evaluating self-governance options including the option of becoming a city.[25]


  1. ^ Crook, Evan (May 7, 2013). "UCSB Alumnus Among the First to Hack Google Glass". The Daily Nexus. Retrieved October 8, 2014. 
  2. ^ Kane, Yukari Iwatani (March 6, 2009). "Breaking Apple's Grip on the iPhone". Wall Street Journal. Retrieved October 8, 2014. 
  3. ^ Grundgeiger, Dave (January 21, 2002). "Top Five Visual Basic .NET Tips". O'Reilly WindowsDevCenter. O'Reilly Media, Inc. Retrieved October 8, 2014. 
  4. ^ Karaorman, Murat; Freeman, Jay (January 2005). "jMonitor: Java Runtime Event Specification and Monitoring Library". Electronic Notes in Theoretical Computer Science (Elsevier) 113: 181–200. doi:10.1016/j.entcs.2004.01.027. Retrieved May 5, 2015. 
  5. ^ Adhikari, Richard (March 20, 2008). "Android, Schmandroid: Linux on the iPhone". Linux Insider. Retrieved July 19, 2015. 
  6. ^ Erica Sadun (February 28, 2008). "Debian-style installation arrives on iPhone". The Unofficial Apple Weblog. Retrieved September 24, 2011. 
  7. ^ Bouman, Amber (March 11, 2009). "Cydia annoys Apple with rogue app store: A new download site makes unauthorized apps available to everyone". InfoWorld. Retrieved May 6, 2015. 
  8. ^ Steven Sande (September 12, 2010). "Alliance of the jailbreakers: Cydia acquires Rock". The Unofficial Apple Weblog. Retrieved August 2, 2011. 
  9. ^ Morris, Paul (December 31, 2013). "Cydia Substrate (Formerly Mobile Substrate) For iOS 7 & 64-bit Devices Released In Cydia!". Redmond Pie. Retrieved October 8, 2014. 
  10. ^ Zdziarski, Jonathan (January 18, 2012). Hacking and Securing iOS Applications. O'Reilly Media, Inc. ISBN 9781449318741. Retrieved October 8, 2014. 
  11. ^ Reid, Ben (October 25, 2014). "AFC2 For iOS 8 / 8.1 Released By Saurik, Gives Full File System Access Over USB". RedmondPie. Retrieved May 6, 2015. 
  12. ^ Jeremy (September 8, 2008). "The Free iPhone Video Recorder - Cycorder". iMore. Retrieved May 6, 2015. 
  13. ^ a b Kane, Yukari Iwatani (December 14, 2009). "App Watch: Exploiting the iPhone Lock Screen". The Wall Street Journal. Retrieved May 9, 2015. 
  14. ^ Kazmucha, Allyson (April 11, 2011). "Daily tip: how to add contact pics to your address book with Cyntact [jailbreak]". iMore. Retrieved May 9, 2015. 
  15. ^ Klosowski, Thorin (March 22, 2013). "Cyueue Adds Quick Song Queuing to the iOS Music App". Lifehacker. Retrieved May 6, 2015. 
  16. ^ Purdy, Kevin (October 21, 2008). "Veency Offers Remote Control of Your Jailbroken iPhone". Lifehacker. Retrieved May 9, 2015. 
  17. ^ Elder, Nic (August 14, 2008). "How to Use WinterBoard (SummerBoard Replacement): A Walkthrough". AppAdvice. Retrieved May 6, 2015. 
  18. ^ Gold, Jon (July 20, 2015). "New un-jailbreaking tool Cydia Impactor for iOS has Android roots". Network World. Retrieved July 21, 2015. 
  19. ^ Jurick, David; Stolarz, Adam; Stolarz, Damien (Apr 2, 2009). iPhone Hacks: Pushing the iPhone and iPod touch Beyond Their Limits. O'Reilly Media, Inc. p. 56. ISBN 9780596555689. Retrieved October 8, 2014. 
  20. ^ Sadun, Erica (November 10, 2008). "Debian ported to G1". Ars Technica. Retrieved October 8, 2014. 
  21. ^ Greenberg, Andy (April 26, 2013). "Google Glass Has Already Been Hacked By Jailbreakers". Forbes. Retrieved October 8, 2014. 
  22. ^ Greenberg, Andy (April 30, 2013). "Developer Warns Of Google Glass Security Risks Following His Jailbreak Exploit". Forbes. Retrieved October 8, 2014. 
  23. ^ Perez, Sarah (May 14, 2013). "Cydia Substrate Comes To Android (Cydia Store Next?)". TechCrunch. Retrieved October 8, 2014. 
  24. ^ Weintraub, Seth (July 21, 2013). "Cydia developer Saurik exploits and fixes Android’s Master Key vulnerability with ‘Impactor’". 9to5Google. Retrieved October 8, 2014. 
  25. ^ Brugger, Kelsey (February 26, 2015). "Isla Vista: Divide and Conquer?: Opinions Split Over Self-Governance Options". The Santa Barbara Independent. Retrieved May 6, 2015.