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Which macOS is your Mac running

From the Apple menu in the top-left in the corner of your screen, choose About This Mac. You’ll see the macOS name, such as macOS Catalina followed by a version number. Need to know the build number, click on the version number.

Version and version number

macOS VersionVersion Number
macOS Monterey12.5
macOS Big Sur11.6.8
macOS Catalina10.15.7
macOS Mojave10.14.6
macOS High Sierra10.13.6
macOS Sierra10.12.6
OS X El Capitan10.11.6
OS X Yosemite10.10.5
OS X Mavericks10.9.5
OS X Mountain Lion10.8.5
OS X Lion10.7.5
Mac OS X Snow Leopard10.6.8
Mac OS X Leopard10.5.8
Mac OS X Tiger10.4.11
Mac OS X Panther10.3.9
Mac OS X Jaguar10.2.8
Mac OS X Puma10.1.5
Mac OS X Cheetah10.0.4

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