Mac OS X
A version of the macOS operating system
DeveloperApple Computer, Inc.
OS family
Source modelClosed, with open source components
Released to
March 24, 2001; 21 years ago (2001-03-24)[1]
Latest release10.0.4 / June 22, 2001; 21 years ago (2001-06-22)[2]
Latest preview13.0 beta 4[3] (22A5311f)[4] (July 27, 2022; 5 days ago (2022-07-27)) [±]
Kernel typeHybrid (XNU)
LicenseApple Public Source License (APSL) and Apple end-user license agreement (EULA)
Preceded byMac OS X Public Beta
Mac OS 9
Succeeded byMac OS X 10.1
Official websiteApple - Mac OS X at the Wayback Machine (archived June 29, 2001)
Support status
Historical, unsupported as of November 13, 2006

Mac OS X 10.0 (code named Cheetah) is the first major release of macOS, Apple's desktop and server operating system. Mac OS X 10.0 was released on March 24, 2001 for a price of US$129. It was the successor of the Mac OS X Public Beta and the predecessor of Mac OS X 10.1 (code named Puma).

Mac OS X was a radical departure from the classic Mac OS and was Apple's long-awaited answer for a next generation Macintosh operating system. It introduced a brand new code base completely separate from Mac OS 9's as well as all previous Apple operating systems, and had a new Unix-like core, Darwin, which features a new memory management system. Unlike subsequent releases starting with Mac OS X 10.2, Mac OS X was not externally marketed with its codename.

System requirements


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Multilingual snags

Mac OS X 10.0 began a short era (that ended with Mac OS X 10.2 Jaguar's release) where Apple offered two types of installation CDs: 1Z and 2Z CDs. The difference in the two lay in the extent of multilingual support.

Input method editors of Simplified Chinese, Traditional Chinese, and Korean were only included with the 2Z CDs. They also came with more languages (the full set of 15 languages), whereas the 1Z CDs came only with about eight languages and could not actually display simplified Chinese, traditional Chinese and/or Korean (except for the Chinese characters present in Japanese Kanji). A variant of 2Z CDs were introduced when Mac OS X v10.0.3 was released to the Asian market (this variant could not be upgraded to version 10.0.4). The brief period of multilingual confusion ended with the release of v10.2.[citation needed] Currently, all Mac OS X installer CDs and preinstallations include the full set of 15 languages and full multilingual compatibility.

Release history

Version Build Date Darwin version Notes
10.0 4K78 March 24, 2001 1.3.1 Original retail CD-ROM release
10.0.1 4L13 April 14, 2001 Apple: Mac OS X 10.0: Software Update 1.3.1, 10.0.1 Update, and Epson Printer Driver Update Provide Feature Enhancement, Address Issues
10.0.2 4P12 May 1, 2001
10.0.3 4P13 May 9, 2001 Update and Before You Install Information
10.0.4 4Q12 June 21, 2001 Apple: 10.0.4 Update and Before You Install Information
4S10 Quicksilver Power Mac G4


Timeline of Macintosh operating systems
ARM architecture familyX86PowerPC68kMacBook Air (Apple silicon)iMac ProRetina MacBook ProMacBook AirApple–Intel architecturePower Mac G5Power Mac G4iMac G3Power MacintoshMacintosh QuadraMacintosh PortableMacintosh SE/30Macintosh IIMacintosh PlusMacintosh 128KmacOS VenturamacOS MontereymacOS Big SurmacOS CatalinamacOS MojavemacOS High SierramacOS SierraOS X El CapitanOS X YosemiteOS X MavericksOS X Mountain LionMac OS X LionMac OS X Snow LeopardMac OS X LeopardMac OS X TigerMac OS X PantherMac OS X 10.2Mac OS X 10.1Mac OS X 10.0Mac OS X Public BetaMac OS X Server 1.0A/UXA/UXA/UXMacWorks XLMacWorks XLSun RemarketingMacWorks XLMac OS 9Mac OS 9Mac OS 9Mac OS 8Mac OS 8Mac OS 8Mac OS 8System 7System 7System 7System 7System 6Classic Mac OSClassic Mac OSClassic Mac OSClassic Mac OSSystem 1Finder (software)Finder (software)Finder (software)Finder (software)Finder (software)Finder (software)Finder (software)


  1. ^ "Mac OS X Hits Stores This Weekend" (Press release). Apple Inc. March 21, 2001.
  2. ^ "Mac OS X Update 10.0.4". Archived from the original on April 11, 2004.
  3. ^ Clover, Juli (July 27, 2022). "Apple Seeds Fourth Beta of macOS 13 Ventura to Developers". MacRumors. Retrieved July 27, 2022.
  4. ^ "macOS 13 beta 4 (22A5311f) - Releases - Apple Developer". Apple Developer. Apple Inc. July 27, 2022. Retrieved July 27, 2022.
  5. ^ Jim Magee. WWDC 2000 Session 106 - Mac OS X: Kernel. 14 minutes in.
  6. ^ "Mac OS X 10.0: Connecting to AppleShare or File Sharing Requires TCP/IP". September 18, 2003. Retrieved February 22, 2010.
  7. ^ Turner, Daniel (March 1, 2001). "Mac OS X: Promise without the polish". ZDNet. Retrieved January 11, 2022.
  8. ^ Jary, Simon (April 12, 2001). "Apple Mac OS X review". Macworld UK. Retrieved January 11, 2022.
Preceded byMac OS 9 Mac OS X 10.0 (Cheetah) 2001 Succeeded byMac OS X 10.1 (Puma)