Phosphor

What it does

Audio sources

It visualizes system audio from apps such as Apple Music, Spotify, Safari, and YouTube using Core Audio Process Tap.checked 8 Oct 2026

Developer

The site identifies the maker as Little Knife Labs LLC.checked 8 Oct 2026

Media controls

It provides play, pause, and skip controls for Apple Music and Spotify in the visualizer and menu bar.checked 8 Oct 2026

Optional microphone mode

Microphone access is off by default; the optional microphone input mode requests permission through macOS.checked 8 Oct 2026

Privacy

The maker says the app runs locally, collects no data, makes no network requests, and immediately discards audio analyzed from Core Audio.checked 8 Oct 2026

Product

Phosphor turns audio playing on a Mac into beat-synced visuals, without a plugin, account, or setup.checked 8 Oct 2026

Recording

Phosphor records visuals with system audio to H.264 MP4 or ProRes 422 LT MOV files saved locally in the Movies folder.checked 8 Oct 2026

Rendering

The app uses Metal GPU rendering, runs at up to 60 fps, drops to 30 fps in Low Power mode, and stops rendering when covered or when the screen sleeps.checked 8 Oct 2026

Scene layers

Users can layer a second scene with normal, add, multiply, or screen blending and set a crossfade duration.checked 8 Oct 2026

Scenes

The site lists scenes including Phosphor, Bassdrop, Rainbow Bars, Tunnel, Nebula, Orbits, Supernova, Kaleido, Oscilloscope, and Terrain FFT.checked 8 Oct 2026

Support

The maker says it answers support emails, usually within a day, and Apple handles App Store refund requests.checked 8 Oct 2026

System requirements

Support lists macOS 14.4 or later, Apple Silicon M1 or newer, at least 4 GB RAM, about 12 MB of disk space, and Metal 3; Intel Macs are unsupported.checked 8 Oct 2026

Viewing modes

It can run as a floating window, fullscreen, or animated desktop wallpaper behind icons and windows.checked 8 Oct 2026

Visual effects

Users can stack effects including CRT, bloom, vignette, grain, chroma, kaleidoscope fold, exposure, pixelation, and blur, then save presets.checked 8 Oct 2026