MacOS version history.
21. Version 14: “Sonoma”
Release date: September 26, 2023
20. Version 13: “Ventura”
Release date: June 6, 2022
19. Version 12: “Monterey”
Release date: June 7, 2021
18. Version 11: “Big Sur”
Release date: June 22, 2020
17. Version 10.15: “Catalina”
Release date: June 3, 2019
16. Version 10.14: “Mojave”
Release date: June 4, 2018
15. Version 10.13: “High Sierra”
Release date: June 5, 2017
14. Version 10.12: “Sierra”
Release date: June 13, 2016
13. Version 10.11: “El Capitan”
Release date: June 8, 2015
12. Version 10.10: “Yosemite”
October 16, 2014
11. Version 10.9: “Mavericks”
Release date: October 22, 2013
10. Version 10.8: “Mountain Lion”
Release date: July 25, 2012
9. Version 10.7: “Lion”
Release date: July 20, 2011
8. Version 10.6: “Snow Leopard”
Release date: August 28, 2009
7. Version 10.5: “Leopard”
Release date: October 26, 2007
6. Version 10.4: “Tiger”
Release date: April 29, 2005
5. Version 10.3: “Panther”
Release date: October 24, 2003
4. Version 10.2: “Jaguar“
Release date: August 23, 2002
3. Version 10.1: “Puma”
Release date: January 7, 2002
2. Version 10.0: “Cheetah”
Release date: March 24, 2001
1. Public Beta: “Kodiak”
Release date: September 13, 2000