Twenty-five years of Mac OS X and macOS
Every Mac OS X and macOS release, in order.
Nine big cats. Thirteen California places.
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A short history
Every modern Mac runs an operating system named after something real. Today, a lake in the Sierra Nevada. Before that, a national park. Before that, a county in California's wine country.
Apple's modern Mac operating system has carried twenty-two names since 2001. Not every year. But every time, on purpose. Together, they form a quiet portrait of the Mac itself.
Before Mac OS X, the names were simpler. System 1. System 7. Mac OS 9. Internal codenames came and went. Harmony. Allegro. Sonata. None of them reached customers.
In March 2001, Mac OS X arrived with a new kind of internal codename. An animal. Cheetah.
Two precursors don't make this list. Kodiak, the Mac OS X Public Beta, shipped in September 2000 for $29.95 — the first appearance of the Aqua interface, and the only paid beta in Apple's history. Hera, Mac OS X Server 1.0, shipped in March 1999 on the Rhapsody foundation, server-only and predating the consumer lineage. Both warmed up the cat era.
The wallpapers
Every default macOS wallpaper, in order.
Hover any to see its name. Click for full size.
For more than a decade, every Mac OS X release wore a predator's name. Tiger. Leopard. Lion. Snow Leopard. Each one fierce. Each one fast.
Some choices surprised. Panther isn't a species at all. It's a black-coated leopard or jaguar. Mountain Lion, eleven years after Puma, names the same animal twice.
Then in 2013, the names changed.
That fall, Mac OS X 10.9 arrived with a different kind of name. Not an animal. A surf spot twenty-nine miles from Apple's headquarters. Mavericks. And for the first time, the update was free.
From Mavericks forward, every release would carry a California name. Yosemite. El Capitan. Sierra. High Sierra. Mojave. Catalina. Big Sur. Monterey. Ventura. Sonoma. Sequoia. Tahoe.
Real places. Most within driving distance of Apple Park.
In 2025, the version number changed too. Apple skipped from macOS 15 to macOS 26. Year-aligned. Unified with iOS, iPadOS, watchOS, tvOS, and visionOS.
The name that year was Tahoe.
macOS was no longer its own product. It was part of a single Apple.
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I. The Cats
Cheetah, Puma, Jaguar, Panther, Tiger, Leopard, Snow Leopard, Lion, Mountain Lion. For more than a decade, every Mac OS X release wore the name of a predator. Most lived thousands of miles from Cupertino.
Nine cats down. Stories like this, every Tuesday.
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Then in 2013, the cats ran out.
Apple came home.
II. The Map
Every macOS since Mavericks has been named after a place in California. Some are surf spots. Some are deserts. One is an island. Most are within driving distance of Apple Park.
You read all twenty-two. The next one's just as good.
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First the predators.
Then the places.
One Mac. All along.
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