Mac OS X, OS X, and macOS Version Information
| Rhapsody Developer Release | Titan1U | August 31, 1997 | DR2 (May 14, 1998) |
| Mac OS X Server 1.0 | Hera | March 16, 1999 | 1.2v3 (October 27, 2000) |
| Mac OS X Developer Preview | n/a | March 16, 1999 | DP4 (April 5, 2000) |
| Mac OS X Public Beta | Kodiak | September 13, 2000 | n/a |
| Mac OS X 10.0 | Cheetah | March 24, 2001 | 10.0.4 (June 22, 2001) |
| Mac OS X 10.1 | Puma | September 25, 2001 | 10.1.5 (June 6, 2002) |
| Mac OS X 10.2 | Jaguar | August 24, 2002 | 10.2.8 (October 3, 2003) |
| Mac OS X 10.3 | Panther | October 24, 2003 | 10.3.9 (April 15, 2005) |
| Mac OS X 10.4 | Tiger | April 29, 2005 | 10.4.11 (November 14, 2007) |
| Mac OS X 10.5 | Leopard | October 26, 2007 | 10.5.8 (August 5, 2009) |
| Mac OS X 10.6 | Snow Leopard | August 28, 2009 | 10.6.8 v1.1 (July 25, 2011) |
| Mac OS X 10.7 | Lion | July 20, 2011 | 10.7.5 (September 19, 2012) |
| OS X 10.8 | Mountain Lion | July 25, 2012 | 10.8.5 (12F45) (October 3, 2013) |
| OS X 10.9 | Mavericks | October 22, 2013 | 10.9.5 (13F1112) (September 18, 2014) |
| OS X 10.10 | Yosemite | October 16, 2014 | 10.10.5 (14F27) (August 13, 2015) |
| OS X 10.11 | El Capitan | September 30, 2015 | 10.11.6 (15G31) (July 18, 2016) |
| macOS 10.12 | Sierra | September 20, 2016 | 10.12.6 (16G29) (July 19, 2017) |
| macOS 10.13 | High Sierra | September 25, 2017 | 10.13.6 (17G65) (July 9, 2018) |
| macOS 10.14 | Mojave | September 24, 2018 | 10.14 (18A391) (September 24, 2018) |
| macOS 10.15 | Catalina | October 7, 2019 | 10.15 (19A583) (October 7, 2019) |