Alongside the public beta of iOS 10, Apple today will be releasing its first public beta for macOS Sierra 10.12, as promised. Previously, the beta was only available to registered paid developers. The public beta is a free alternative and is open to the first one million users who sign up.
The macOS Sierra public beta comes several days after the release of the developer build. If the public beta for OS X El Capitan is any indication, the public beta will typically get every other release of the developer build.
To get your hands on the public beta, visit Apple’s Beta Software Program site.