I built Reactive Wallpaper for a truly native experience, no web wrappers, no video files, just Metal shaders on the GPU. All 45 effects are hand-written fragment shaders. Cursor position is passed as a uniform, so animations react to your mouse in real time. Since macOS has no native live wallpaper API, I render into a window layer behind desktop icons. Multi-display, pauses when covered or on battery. One-time purchase. No subscriptions, ever. Would love your feedback.