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Mac Os Release History
| Year | Event |
|---|---|
| 1978 | In June 1978, Apple introduced Apple DOS 3.1, the first operating system for the Apple computers. |
| 1984 | Apple introduced System 1 in 1984. |
| 1985 | Apple introduced System 2 in 1985. |
| 1986 | Apple introduced System 3 in 1986. |
| 1987 | Apple introduced System 4 in 1987. |
| 1988 | Apple introduced System 6 in 1988. |
| 1991 | Apple introduced System 7 operating system on May 13, 1991. |
| 1995 | Apple allowed other computer companies to clone its computer by announcing it licensed the Macintosh operating system rights to Radius on January 4. |
| 1997 | Apple introduced macOS 8 in 1997. |
| 1997 | Apple bought NeXT Software Inc. for $400 million and acquired Steve Jobs, Apple co-founder, as a consultant. |
| 1999 | Apple introduced macOS 9 in 1999. |
| 1999 | Apple released macOS X Server 1.0 on March 16, 1999. |
| 2001 | Apple introduced macOS X 10.0, code-named Cheetah, and became available on March 24, 2001. |
| 2001 | Apple introduced macOS X 10.1, code-named Puma, and became available on September 25, 2001. |
| 2002 | Apple introduced macOS X 10.2, code-named Jaguar, and became available on August 23, 2002. |
| 2003 | Apple introduced macOS X 10.3, code-named Panther, on October 25, 2003. |
| 2004 | Apple introduced macOS X 10.4, code-named Tiger, at the WWDC on June 28, 2004. |
| 2007 | Apple introduced macOS X 10.5, code-named Leopard, on October 26, 2007. |
| 2008 | Apple introduced MobileMe at the WWDC on June 9, 2008. |
| 2009 | Apple introduced macOS X 10.6, code-named Snow Leopard, at the WWDC on June 8, 2009. |
| 2010 | Apple introduced macOS X 10.7, code-named Lion, at the 'Back to the Mac' event on October 20, 2010. The operating system was later released on July 20, 2011. New features included AirDrop, Gatekeeper, and many more. |
| 2012 | Apple released macOS X 10.8, code-named Mountain Lion, on July 25, 2012. |
| 2013 | Apple introduced macOS X 10.9, code-named Mavericks, at the WWDC on June 10, 2013. |
| 2014 | Apple introduced macOS X 10.10, code-named Yosemite, at the WWDC on June 2, 2014. Yosemite was later released on October 16, 2014. |
| 2014 | Apple introduced Force Touch, a haptic feedback system for macOS. Simultaneously, they launch a similar feedback system for iOS called 3D Touch. |
| 2015 | Apple introduced macOS X 10.11, code-named El Capitan, at the WWDC on June 8, 2015. |
| 2016 | Apple introduced macOS X 10.12, code-named Sierra, at the WWDC on June 13, 2016. |
| 2017 | Apple introduced macOS X 10.13, code-named High Sierra, at the WWDC on June 5, 2017. |
| 2018 | Apple introduced macOS X 10.14, code-named Mojave, at the WWDC on June 4, 2018. |
| 2018 | Apple introduced Dark Mode in macOS X 10.14 (Mojave), a feature that turns the background to black and text to white. Dark Mode is easier on users' eyes at night, reducing eye strain. |
| 2019 | Apple introduced macOS X 10.15, code-named Catalina, at the WWDC on June 3, 2019. |
Mac OS, operating system (OS) developed by the American computer company Apple Inc. The OS was introduced in 1984 to run the company’s Macintosh line of personal computers (PCs). The Macintosh heralded the era of graphical user interface (GUI) systems, and it inspired Microsoft Corporation to develop its own GUI, the Windows OS.
Complete technical specs on every Mac and Mac clone organized by the introduction year follow for your convenience. To view each Mac released from 1984 to the present on a dynamic, interactive timeline, you also may find EveryMac.com's Ultimate Mac Timeline useful. If a macOS installer can't be used on your Mac, the installer will let you know. For example, it may state that your Mac doesn't have enough free storage space for the installation or that the installer is too old to be opened on this version of macOS. Feb 18, 2012 But the hunt finally reached its quarry with the release of Mac OS X in 2001. But it would take until Mac OS X 10.2 (Jaguar) before the system was really able to hold its own. Apple's first major OS X release, known as Cheetah, was a radical change from the previous Mac OS 9, Apple's Classic Operating System.Announced at the 2000 Macworld Expo in San Francisco, Mac OS X.
To get the latest features and maintain the security, stability, compatibility and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.
Find out how to upgrade to macOS Big Sur, the latest version of macOS.
Check compatibility
If a macOS installer can't be used on your Mac, the installer will let you know. For example, it may state that your Mac doesn't have enough free storage space for the installation or that the installer is too old to be opened on this version of macOS.
If you want to check compatibility before downloading the installer, find out more about the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan or Yosemite. You can also check compatible operating systems on the product ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini or Mac Pro.
Make a backup
Before installing, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Find out how to back up your Mac.
Download macOS
It takes time to download and install macOS, so make sure you're plugged into AC power and have a reliable Internet connection.
These installers from the App Store will open automatically after you've downloaded them:
- macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite or Mavericks
- macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks or Mountain Lion
- macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion or Lion
Your web browser will download the following older installers as a disk image called InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It will install an app named Install [Version Name]. Open that app from your Applications folder to start installing the operating system.
- macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion or Lion
- OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion or Snow Leopard
- OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion or Snow Leopard
Install macOS
Follow the onscreen instructions in the installer. It may be easiest to start the installation in the evening so that it can be completed overnight, if needed.
If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.
Mac Os Release History
Learn more
Mac Os X Release History
You may also be able to use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS, or install the macOS that came with your Mac.