What OS Version Are You Running? Here’s How to Find Out.

In Troubleshooting 101, one of the first questions is always, “What version of the operating system are you running?” There’s a big difference between Mac OS X 10.6 Snow Leopard and macOS 10.15 Catalina, and the solution to any particular problem will likely revolve around knowing what operating system is installed.

The same is true of Apple’s other operating systems: iOS, watchOS, and tvOS. And, although they aren’t quite in the same category, Apple’s AirPods and HomePod both have system software that can be updated as well.

So the next time you’re experiencing a problem, make sure to include the version number in your searches on the internet. Here’s how to find the version of each of Apple’s operating systems.


On Mac, click the Apple menu in the upper-left corner of the screen and choose About This Mac. A window opens, displaying the name (macOS High Sierra shown here) and version (10.13.4) of the running version of macOS.

The first number, 10, refers to the numeral “X” in Mac OS X which was the name Apple used until they changed to macOS for naming consistency with their other software. That number hasn’t changed since OS X was first released in 2001. The second number, 13 in the example above is the major release. Currently, Apple has a major release once per year, and those are linked to a new name. 13 is High Sierra, 12 is Sierra, 11 is El Capitan. And the third number is the minor version. These are released roughly every one to two months and are typically simply maintenance, bug, and security fixes. Occasionally they will add a new feature but they are usually just small things that weren’t ready when the major release came out. If the third number is missing it’s an implied zero, which means that you are running the very initial major release with no patches installed. If someone on the internet doesn’t use the third number they either mean the initial major release or they are referring more broadly to no specific minor release. You may have to look for context clues or ask.

Every now and then, it can be important to learn the build number too—it’s one step more specific than the version number. A new Mac may have a different build number of the same version of macOS, for instance, or Apple may push out a silent security update that changes the build number. To find the build number, simply click the version number—the six-character build number (17E202) appears in parentheses, as above.


On an iPhone, iPad, or iPod touch, you find the version number in Settings > General > About. Scan down the screen until you see the Version line, which tells you both the version of iOS and the build number.


There are two ways to find the version of watchOS running on Apple Watch:

  • On the watch, open the Settings app, scroll down to and tap General, tap About, and then scroll down until you see Version.
  • On your iPhone, open the Watch app and make sure My Watch is selected in the bottom button bar. Then go to General > About to see a screen that displays much the same information as the Settings app on the watch, including the version number.


By now, you can probably guess that on Apple TV you go to Settings > General > About to find the tvOS version. Apple is nicely consistent in this regard. That said, only the fourth-generation Apple TV and Apple TV 4K run tvOS. The obsolete second- and third-generation Apple TVs are instead based on a stripped-down version of iOS, and the first-generation Apple TV is an entirely different beast yet, with its large white case and internal hard drive.


You’re unlikely to need to check the version of your AirPods, but if it ever comes up, make sure the AirPods are either connected to their host iOS device or in their case with the top open. Then, on the host iOS device, go to Settings > General > About > AirPods and look for the Firmware Version line.


Although the HomePod shipped only recently, Apple has already released software updates for their new premium speaker. To check the version of the HomePod software, open Apple’s Home app on your iPhone, make sure Home is selected in the bottom toolbar, and then press and hold on the HomePod’s tile until it opens. Then tap the Details button in the lower right and scroll down until you see the Version line.