This is a free, browser-based oscilloscope and audio visualizer backdrop. It draws an animated scope on a fullscreen canvas in one of four styles: a classic waveform trace, frequency bars (a spectrum analyzer that splits sound into bands), mirrored bars for a symmetric lower-third look, or a radial scope that wraps the spectrum into a circle. Everything runs locally in your browser — nothing to install and no audio is ever uploaded.
Pick a visualizer from the Style menu, then choose an Audio Source. The built-in demo generates a synthetic signal so the scope animates with no microphone at all; selecting Microphone makes the display react to live sound — your browser will ask for mic permission, and the audio is analyzed locally and never leaves your device. Use the Sensitivity slider to scale how strongly the scope responds, and the Color menu to switch between phosphor green, cyber cyan, red, neon purple, amber, or a cycling rainbow. Press START to begin, FULLSCREEN for a clean borderless view, and the H key any time to hide or bring back the control panel.
The visualizer makes a handy backdrop for music streams, podcasts, and "now playing" screens — point a mic at your speakers or run it as a browser source in OBS for an instant audio-reactive overlay. It also works well as ambient visuals for parties and live events, or as a sci-fi monitor prop in synthwave scenes, videos, and photo shoots.
If you like this backdrop, try the Matrix rain animation, the starfield screensaver, or the tech dashboard — and the streaming toolkit collects more overlays made for OBS.