League players on Mac have never had a real in-game overlay — Porofessor, Blitz and Mobalytics all run on Overwolf, which is Windows-only. Rift Companion is built natively for the Mac client. Lock your champion and popular runes + the current-patch build appear instantly. In game, it pins build and matchup/counter-build panels beside League, tracks enemy summoner-spell cooldowns, and shows your gold lead on Tab. It's read-only, asks for no macOS permissions by default, no account, and free.
