Had macOS been numbered sequentially from day one, we’d be on macOS 30 as of today. Classic macOS 1–9 Cats macOS 10 Cheetah macOS 11 Puma macOS 12 Jaguar macOS 13 Panther macOS 14 Tiger macOS 15 Leopard macOS 16 Snow Leopard macOS 17 Lion macOS 18 Mountain Lion Places macOS 19 Mavericks macOS 20 Yosemite macOS 21 El Capitan macOS 22 Sierra macOS 23 High Sierra macOS 24 Mojave macOS 25 Catalina macOS 26 Big Sur macOS 27 Monterey macOS 28 Ventura macOS 29 Sonoma macOS 30 Sequoia