A music visualizer that reads the actual signal
Plenty of browser visualizers animate a shape and hope it lines up. Audio Universe rebuilds its particle field from a live FFT every frame, so what you see is the spectrum of what you are hearing - the low end moves the mass, the highs scatter it, and the BPM estimate keeps the rotation honest when the track changes tempo.
Useful on stage, not only on a desk
The whole thing is one browser tab with keyboard shortcuts for the three things you need mid-set: fullscreen, mic on or off, and pause. Drop the particle count and it happily runs on the laptop you already brought, on a projector, on a second screen behind the booth. There is nothing to install on a machine that is not yours.
Wired into the rest of the studio
Audio Universe shares the GOONS AudioContext, so it can visualise the other apps as easily as it visualises your microphone - run a drum machine, a synth or the sampler and point the galaxy at it. One subscription covers every app in the catalog, and a 7-day free trial covers the deciding.