Phase Shift is not available for Mac but there are some alternatives that runs on macOS with similar functionality. The best Mac alternative is Rocksmith. It's not free, so if you're looking for a free alternative, you could try Frets on Fire or Clone Hero. If that doesn't suit you, our users have ranked more than 10 alternatives to Phase Shift and five of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Phase Shift are FoFiX (Free, Open Source) and Bemuse: Beat, Music, Sequence (Free).
Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller, Game Controllers, or just your standard computer keyboard. Download the game, copy your song charts into the song folder and enjoy hours of fun!.