Which Mac OS Version Do I Have Installed?

Which macOS version do I have installed?

From the Apple menu apple icon in the upper left corner of your screen, choose “About This Mac.” You should see the macOS name, such as macOS Catalina, followed by its version number. If you need to know the build number as well, click the version number to see it.  If you need to update this version, you can click “Software Update” and follow the prompts.

About This Mac window for macOS Catalina

This example shows macOS Catalina version 10.15 build 19A583.

Which macOS version is the latest?  Which macOS version should I have installed?

These are all Mac operating systems, starting with the most recent. When a major new macOS is released, it gets a new name, such as macOS Catalina. As updates that change the macOS version number become available, this article will be updated to show the latest version of that macOS.

If your Mac is using an earlier version of any Mac operating system, you should install the latest Apple software updates, which can include important security updates and updates for the apps that are installed by macOS, such as Safari, Books, Messages, Mail, Music, Calendar, and Photos. 

If you are not running the most recent OS from Apple, you may experience issues with web pages and apps.  We recommend visiting the App Store to download the most recent version.

Below you will find a list of recent version, with the most current version listed first: