Ambertone turns whatever’s playing on your Mac — Spotify, Apple Music, YouTube — into light that moves with the sound. Leave it running while you work or unwind, and your music becomes part of the room. It reacts to system audio in real time, following volume, rhythm and stereo, with no setup and no account. It only listens; nothing is recorded or sent. Free with two skins, with new ones added over time as one-time purchases. macOS 14.4+, Apple Silicon.