RallyCue is a standalone Wear OS tennis scorekeeper. Tap Listen after a point and call the score. RallyCue checks what it heard against the match state before changing anything, and asks you if it doesn't add up. Big touch buttons, exact Undo, deuce, advantage, tiebreaks and sets are built in. Speech runs on the device, raw audio isn't stored, and there's no account, ads or analytics. Core scoring is free; Pro is a one-time purchase for Natural Score.