I built Halo because my desk is dark and my music isn't. It draws light along the edges of your display, and the light is the track you are playing. Two colours are pulled from the album artwork in Music or Spotify. The bass sits as a dense line that swells and thins with the kick. Mids drift behind it as a soft haze. Highs scatter into thin rays, and on the loudest peaks the core of the line goes past white into HDR and throws off sparks. A few things I care about: It listens to system audio through a Core Audio process tap. The microphone is never touched, and you can restrict it to Music and Spotify only. It stays visible over full screen apps and behind the Dock, so it does not fight with anything you are doing. Thickness, saturation and per-band brightness are all yours to set. If you want only the bass line and no highs, you can have that. Free to download, 7.99 once to unlock. Not a subscription. Seven day trial, and no account to make. One honest oddity: the glow is drawn in a system level window, so it does not appear in screenshots or screen recordings at all. Showing it off is genuinely awkward, and it looks better in person than I can show you here. Apple Silicon, macOS 15 and up. I would love to hear what you would want from it. Other players, more colour sources, reacting to something other than music.

Halo Ambient Light

Your screen edges glow with your music

Your screen edges glow with your music