The Aqua Screenshot Library is a meticulously compiled database of over 1,500 images cataloging every major release of macOS since September 2000’s Public Beta. Hackett explains that he captured screenshots of major features and applications across each version running on actual period-correct hardware, not virtual machines:
These images came from the OS, running on actual hardware; I didn’t use virtual machines at any point. I ran up to 10.2 on an original Power Mac G4, while a Mirror Drive Doors G4 took care of 10.3, 10.4 and 10.5. I used a 2010 Mac mini for Snow Leopard and Lion, then a couple different 15-inch Retina MacBook Pros to round out the rest.
Beyond providing a comprehensive visual reference guide to the Mac’s operating system, the library offers a birds-eye view of design trends over the years (who could forget OS X Lion’s leather-themed iCal?) and a fun look at the changing styles of specific user interface elements.
Check out the full gallery for a trip down memory lane, and keep the page bookmarked, as Hackett promises regular updates for future versions of macOS.