Apple Operating Systems

There was no OS for the Apple I.

* 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

### 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
* OS X Yosemite – 10.10
* OS X El Capitan – 10.11
* macOS Sierra – 10.12
* macOS High Sierra – 10.13

#### 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

* 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

## Apple TV

### 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

## 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 "OS X" (At the time, "macOS" was still known as "Mac OS X" and not "OS X" as it was known from 2012 to 2016.)
* 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

## 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