Prostir Zvuku arranges rain, fire, wind, birdsong, and half a dozen other nature sounds on a spatial canvas around a wireframe head, so you drag each one into position — campfire to the right, rain behind you, birds off in the distance — instead of balancing volume sliders. With supported AirPods, head tracking keeps every sound anchored in place as you turn your head. The mixer, presets, and sleep timer are free; a one-time $12.99 unlocks the Pro tier.