macOS Versions: A Comprehensive Guide
From Cheetah to Sequoia and Beyond
Curious about the evolution of macOS? This guide covers every version from Mac OS X to the latest macOS Sequoia.
A Historical Overview
Macs have run macOS (previously Mac OS X) since 2001. Based on NeXT Computer's technology, macOS is Unix-based and has evolved significantly over the years. Key features include integration with iOS, cloud services, Time Machine backups, and Quick Look.
For a visual journey through macOS history, check out our
macOS Version List
- OS X 10 beta (Kodiak): September 13, 2000
- OS X 10.0 (Cheetah): March 14, 2001
- OS X 10.1 (Puma): September 15, 2001
- …
- macOS 15 (Sequoia/Glow): September 18, 2024
For details on each version's latest release and code names, refer to the complete list within the article. See which Macs support specific macOS versions here.
How to Check Your macOS Version
Click the Apple logo in the top left corner and select 'About This Mac'.
How to Update macOS
Updating depends on your current macOS version. Older versions used Software Update, while newer ones update through System Settings (or System Preferences pre-Ventura). Automatic updates can be enabled in Software Update settings.
Learn more about Apple's mobile operating systems and customizing Apple Mail in iOS 18.2. For related information, explore easy password import to Apple Passwords.