| Version | Codename | Date Announced | Release Date | Most Recent Version |
|---|---|---|---|---|
| Rhapsody Developer Release | Grail1Z4 / Titan1U | August 31, 1997 | May 14, 1998 | |
| Mac OS X Server 1.0 | Hera | March 16, 1999 | 1.2v3 (October 27, 2000) | |
| Public Beta | Kodiak | September 13, 2000 | ||
| 10.0 | Cheetah | March 24, 2001 | 10.0.4 (June 22, 2001) | |
| 10.1 | Puma | July 18, 2001[69] | September 25, 2001 | 10.1.5 (June 6, 2002) |
| 10.2 | Jaguar | May 6, 2002[70] | August 24, 2002 | 10.2.8 (October 3, 2003) |
| 10.3 | Panther | June 23, 2003[71] | October 24, 2003 | 10.3.9 (April 15, 2005) |
| 10.4 | Tiger | May 4, 2004[72] | April 29, 2005 | 10.4.11 (November 14, 2007) |
| 10.5 | Leopard | June 26, 2006[73] | October 26, 2007 | 10.5.8 (August 5, 2009) |
| 10.6 | Snow Leopard | June 9, 2008[74] | August 28, 2009 | 10.6.8 (June 23, 2011) |
| 10.7 | Lion | October 20, 2010[75] | July 20, 2011 | 10.7.1 (August 16, 2011) |
| 10.8 | Mountain Lion | July 25, 2012 | 10.8 |