The following is a list of operating systems released by Apple Inc.

Apple computers

Apple II

• Apple DOS is the first operating system for Apple computers.^[1]
• Apple ProDOS
• Apple GS/OS

Apple III

• Apple SOS

Apple Lisa

• Lisa OS
• MacWorks XL

Macintosh computers

Classic Mac OS

• System 1
• System 2
• System 3
• System 4
• System Software 5 – also marketed as System 5
• System Software 6 – also marketed as System 6
• System 7 – System 7.5.1 was the first to refer to itself as Mac OS, Mac OS 7.6 was the first to be branded as "Mac OS"
• Mac OS 8
• Mac OS 9 – Mac OS 9.2.2 was the last version of Classic Mac OS

Mac OS X / OS X / macOS

macOS was previously known as Mac OS X and later OS X.

• Mac OS X Public Beta – code name Kodiak
• Mac OS X 10.0 – code name Cheetah
• Mac OS X 10.1 – code name Puma
• Mac OS X 10.2 – also marketed as Jaguar
• Mac OS X Panther – 10.3
• Mac OS X Tiger – 10.4
• Mac OS X Leopard – 10.5
• Mac OS X Snow Leopard – 10.6
• Mac OS X Lion – 10.7 – also marketed as OS X Lion
• OS X Mountain Lion – 10.8
• OS X Mavericks – 10.9 (free)
• OS X Yosemite – 10.10 (free)
• OS X El Capitan – 10.11 (free)
• macOS Sierra – 10.12 (free)
• macOS High Sierra – 10.13 (free)
• macOS Mojave – 10.14 (free)
• macOS Catalina – 10.15 (free)
• macOS Big Sur – 11 (free)
• macOS Monterey – 12 (free)
• macOS Ventura – 13 (free)

macOS Server

macOS Server was previously known as Mac OS X Server and later OS X Server.

• Mac OS X Server 1.0 – code name Hera, also referred to as Rhapsody
• Mac OS X Server 10.0 – code name Cheetah
• Mac OS X Server 10.1 – code name Puma
• Mac OS X Server 10.2 – code name Jaguar
• Mac OS X Server 10.3 – code name Panther
• Mac OS X Server 10.4 – code name Tiger
• Mac OS X Server 10.5 – also marketed as Leopard Server
• Mac OS X Server 10.6 – also marketed as Snow Leopard Server

Starting with Lion, there is no separate Mac OS X Server operating system. Instead the server components are a separate download from the Mac App Store.

• Mac OS X Lion Server – 10.7 – also marketed as OS X Lion Server
• OS X Mountain Lion Server – 10.8 – also marketed as Mountain Lion Server
• OS X Mavericks Server – 10.9 – also marketed as Mavericks Server
• OS X Yosemite Server – 10.10 – also marketed as Yosemite Server 4.0
• OS X 10.11 Server 5.0 – also marketed as OS X Server 5.0
• OS X 10.11 Server 5.1 – also marketed as OS X Server 5.1
• macOS 10.12 Server 5.2 – also marketed as macOS Server 5.2
• macOS 10.12 Server 5.3 – also marketed as macOS Server 5.3
• macOS 10.13 Server 5.4 – also marketed as macOS Server 5.4
• macOS 10.13 Server 5.5 – also marketed as macOS Server 5.5

Other macOS-related releases

• bridgeOS – powers the Touch Bar and other internal components
• NeXTSTEP
• OPENSTEP
• Darwin

Others

• A/ROSE
• A/UX
• AIX for Apple Network Servers
• Macintosh Application Environment
• MkLinux
• PowerOpen Environment
• Star Trek – unreleased
• Taligent – unreleased
• Copland – unreleased

Mobile devices

Newton

• Newton OS

iPod

• iPod OS

iOS

iOS was previously known as iPhone OS, despite also being available on the iPod Touch (1st, 2nd, and 3rd generations) and the original iPad.

• iPhone OS 1 – derived from "Mac OS X" (now known as "macOS")
• iPhone OS 2
• iPhone OS 3
• iOS 4 – continued from iPhone OS 3
• iOS 5
• iOS 6
• iOS 7
• iOS 8
• iOS 9
• iOS 10
• iOS 11
• iOS 12
• iOS 13
• iOS 14
• iOS 15
• iOS 16

iPadOS

At its June 2019 Worldwide Developer Conference, Apple introduced iPadOS, a version of iOS, for iPad tablets, promised for fall 2019 release.^[2][3]

• iPadOS 13 – derived from iOS 13
• iPadOS 14 – derived from iOS 14
• iPadOS 15 – derived from iOS 15
• iPadOS 16 - derived from iOS 16

watchOS

• watchOS 1 – derived from iOS 8
• watchOS 2 – derived from iOS 9
• watchOS 3 – derived from iOS 10
• watchOS 4 – derived from iOS 11
• watchOS 5 – derived from iOS 12
• watchOS 6 – derived from iOS 13
• watchOS 7 – derived from iOS 14
• watchOS 8 - derived from iOS 15
• watchOS 9 - derived from iOS 16

Living room

Apple TV Software

• Apple TV Software 1 – derived from Mac OS X 10.4 Tiger
• Apple TV Software 2 – derived from Mac OS X 10.4 Tiger
• Apple TV Software 3 – derived from Mac OS X 10.4 Tiger
• Apple TV Software 4 – derived from iOS 4 and iOS 5
• Apple TV Software 5 – derived from iOS 5 and iOS 6
• Apple TV Software 6 – derived from iOS 7
• Apple TV Software 7 – derived from iOS 8

There was no Apple TV Software 8, version 8 was skipped when moving to tvOS.

tvOS

• tvOS 9 – derived from iOS 9
• tvOS 10 – derived from iOS 10
• tvOS 11 – derived from iOS 11
• tvOS 12 – derived from iOS 12
• tvOS 13 - derived from iOS 13
• tvOS 14 - derived from iOS 14
• tvOS 15 - derived from iOS 15
• tvOS 16 - derived from iOS 16

audioOS

Table of operating systems