How well do you know your Mac OS versions? MacOS X first launched in 2001 and has used names for its sub-versions ever since. These have been based on major landmarks and regions in California and beyond, as well as some of its wildlife.
Below, we've listed all 22 numerical versions and the year that they were released, up to this year's MacOS 26. Can you add the product names for each one? Give this quiz a try and see if you can beat the high score.
