Timeline of macOS
The Mac operating system from its graphical desktop in 1984 through NeXT’s Unix foundations, Mac OS X, and the end of Intel support in new macOS releases in 2026.
- Category
- Engineering & Technology
- Tag
- computing
- Events
- 24 events 1984 – 2026
- Generated
- by gpt-6
1984: The Macintosh ships a graphical desktop
Apple’s original Macintosh shipped with a mouse-driven interface, windows, menus, and the Finder. The classic Macintosh system established interaction conventions that the later Unix-based Mac OS X would preserve while replacing its underlying architecture.
https://en.wikipedia.org/wiki/System_11989: NeXTSTEP brings Unix to a graphical workstation
NeXT released NeXTSTEP, combining a Mach-based system, Unix facilities, and an object-oriented application environment. Its development tools and frameworks later supplied much of the foundation for Mac OS X.
https://en.wikipedia.org/wiki/NeXTSTEP1997: Apple completes its acquisition of NeXT
Apple completed its purchase of NeXT following the agreement announced in December 1996. NeXT’s operating-system technology became the basis for Apple’s replacement for the aging classic Mac OS, and Steve Jobs returned to Apple.
https://en.wikipedia.org/wiki/NeXT1999: Darwin exposes the new system’s foundations
Apple released Darwin, the open-source core underlying its new operating-system work. Darwin included kernel and Unix components, while Apple’s complete desktop interface and many higher-level frameworks remained separate proprietary software.
https://en.wikipedia.org/wiki/Darwin_(operating_system)2000: A public beta previews Mac OS X
Apple sold a public beta of Mac OS X, giving users early access to the Aqua interface and the new Unix-based system. The beta invited feedback before the general release and exposed compatibility and performance challenges.
https://en.wikipedia.org/wiki/Mac_OS_X_Public_Beta2001: Mac OS X reaches its first release
Apple released Mac OS X 10.0 on March 24. Protected memory and preemptive multitasking supplied a new foundation for the Mac, while the Classic environment helped users continue running many older applications.
https://en.wikipedia.org/wiki/Mac_OS_X_10.02002: Jaguar accelerates desktop compositing
Mac OS X Jaguar introduced Quartz Extreme, using supported graphics hardware for desktop compositing. The release also added features such as Rendezvous networking, later renamed Bonjour, to simplify discovering services on local networks.
https://en.wikipedia.org/wiki/Mac_OS_X_Jaguar2003: Panther adds Exposé and FileVault
Mac OS X Panther introduced Exposé for arranging visible windows and FileVault for encrypting users’ home directories. The release combined changes to everyday window management with a new built-in data-protection option.
https://en.wikipedia.org/wiki/Mac_OS_X_Panther2005: Tiger introduces indexed desktop search
Mac OS X Tiger added Spotlight, an indexed search system spanning files and metadata. The release also introduced Automator, allowing users to assemble workflows from actions supplied by applications.
https://en.wikipedia.org/wiki/Mac_OS_X_Tiger2006: Mac OS X begins running on Intel
Apple shipped its first Intel-based Macs with Mac OS X Tiger. Universal applications contained code for both Intel and PowerPC processors, while Rosetta translated many existing PowerPC applications during the transition.
https://en.wikipedia.org/wiki/Mac_transition_to_Intel_processors2007: Leopard adds automatic versioned backups
Mac OS X Leopard introduced Time Machine, a backup system designed around browsing earlier versions of files. The release also added Spaces and gained UNIX 03 certification on supported Intel systems.
https://en.wikipedia.org/wiki/Mac_OS_X_Leopard2009: Snow Leopard focuses on the Intel platform
Mac OS X Snow Leopard dropped support for PowerPC Macs and emphasized internal improvements. Grand Central Dispatch and OpenCL gave developers additional ways to use multicore processors and compatible graphics hardware.
https://en.wikipedia.org/wiki/Mac_OS_X_Snow_Leopard2011: The Mac App Store opens
Apple launched the Mac App Store for Snow Leopard, offering centralized discovery, purchases, and updates for participating applications. Mac OS X Lion followed later in the year with distribution through the store.
https://en.wikipedia.org/wiki/App_Store_(Apple)#Mac_App_Store2012: Gatekeeper checks downloaded applications
OS X Mountain Lion introduced Gatekeeper controls for applications obtained outside the Mac App Store. Developer signing supplied an additional basis for deciding whether downloaded software should be allowed to launch.
https://en.wikipedia.org/wiki/OS_X_Mountain_Lion2013: Mavericks makes major upgrades free
Apple released OS X Mavericks as a free upgrade for supported Macs. The release also introduced memory compression and energy-saving changes, while removing the purchase price attached to earlier major operating-system upgrades.
https://en.wikipedia.org/wiki/OS_X_Mavericks2014: Yosemite links work across Apple devices
OS X Yosemite introduced a redesigned interface and Continuity features such as Handoff. Supported applications could pass ongoing work between a Mac and nearby Apple mobile devices associated with the same account.
https://en.wikipedia.org/wiki/OS_X_Yosemite2015: System Integrity Protection limits privileged changes
OS X El Capitan introduced System Integrity Protection, restricting modifications to protected system locations even by privileged processes. The change reduced what software running as the root user could alter during normal operation.
https://en.wikipedia.org/wiki/System_Integrity_Protection2016: Sierra adopts the macOS name
Apple renamed OS X to macOS with the release of Sierra. The release brought Siri to the Mac and added features including Universal Clipboard, aligning the desktop system more closely with Apple’s other device platforms.
https://en.wikipedia.org/wiki/MacOS_Sierra2017: High Sierra adopts Apple File System
macOS High Sierra made Apple File System the default for supported all-flash startup storage. The filesystem introduced capabilities including snapshots, space sharing, and cloning, replacing the older HFS Plus foundation on those configurations.
https://en.wikipedia.org/wiki/MacOS_High_Sierra2019: Catalina ends support for 32-bit applications
macOS Catalina required 64-bit applications and separated the system volume from user data. It also introduced Mac Catalyst, helping developers adapt iPad applications to the Mac, and replaced iTunes with separate media applications.
https://en.wikipedia.org/wiki/MacOS_Catalina2020: Big Sur supports Apple silicon
macOS Big Sur became version 11 and supported the first Macs powered by Apple’s M1 chip. Universal applications and Rosetta 2 translation helped developers and users move from Intel processors to Apple silicon.
https://en.wikipedia.org/wiki/MacOS_Big_Sur2024: Sequoia brings iPhone interaction to the desktop
macOS Sequoia introduced iPhone Mirroring on compatible devices, letting users interact with an iPhone from a Mac; the feature was unavailable in the European Union at launch. The release also added window-tiling controls and a standalone Passwords application.
https://en.wikipedia.org/wiki/MacOS_Sequoia2025: Tahoe aligns version numbers across Apple platforms
Apple released macOS Tahoe 26 with the Liquid Glass visual design and an expanded Spotlight interface. The jump from version 15 to 26 aligned its numbering with the other Apple operating systems released that year.
https://en.wikipedia.org/wiki/MacOS_Tahoe2026: macOS 27 ends Intel Mac support
Apple released macOS Golden Gate 27 on September 14 for Macs with Apple silicon only; macOS Tahoe 26 was the last major version to run on Intel Macs. Apple had completed its Mac hardware transition to Apple silicon in 2023 with the Mac Pro.
https://en.wikipedia.org/wiki/MacOS_Golden_Gate