What it is
Kauna is a small Windows app that renders clean, minimal visualizations of whatever audio the machine is playing: spectrum bars, circular waves, flame effects. Install from the Microsoft Store, press play, done. It is the visualizer equivalent of a well-made VU meter, and there is real charm in that restraint.
What it costs
Free, Windows only.
Best for
A second monitor while music plays. Streamers who want a tidy reactive element without compositing work. Anyone who finds preset-roulette visualizers exhausting.
Skip it if
You want the visuals to feel designed for the music rather than measuring it. Kauna draws level and spectrum as measured, and that honest meter look is all it does. The step up in every direction is on the map.