macOS 10.12 Sierra is Apple's thirteenth major release of the macOS/OS X operating system, announced on June 13, 2016.

Sierra's logo

10.12, Apple's thirteenth major release of the macOS operating system. It was released to end users on September 20, 2016, as a free upgrade through the Mac and it was succeeded by macOS on September 25, 2017.

Main changes from macOs Sierra:

  • and is now on the Mac.
  • two new features: copy-paste between your Mac and your iPhone, and the ability to unlock your Mac with your Apple Watch.
  • expands to include your and documents
  • on Mac gets all the new features of Photos on iOS
  • Optimized Storage is a new automated system for dealing with storage space on your Mac.

System Requirements for macOS Sierra:

  • 2 GB RAM
  • OS X 10.7.5 or later
  • 8.8 GB of free hard drive space

Devices supporting macOS Sierra:

  • MacBook: late 2009 and later
  • MacBook Pro: mid 2010 and later
  • MacBook Air: late 2010 and later
  • Mac Mini: mid 2010 and later
  • Mac Pro: mid 2010 and later
  • iMac: late 2009 and later