MacOS Sierra is a free upgrade and works on any Mac dating back to 2010, and on MacBooks and iMacs from 2009. Older hardware will still work with OS X 10.11 El Capitan, which you’re probably using now. Some new features may not work on older Macs that can run the OS, however.

Is macOS High Sierra free?

Like previous versions of macOS, High Sierra is a free upgrade.

Does it cost money to upgrade to Sierra?

On Tuesday, Apple released macOS Sierra 10.12. It’s a free upgrade, and many Mac users around the world will rush to install it.