How I Built a Real-Time Audio Visualizer with the Web Audio API

What is a browser-based audio visualizer?

A browser-based audio visualizer is a real-time graphical display that converts live audio signals into visual patterns — waveforms, frequency spectrums, or spectrograms — using the Web Audio API and HTML5 Canvas, entirely on the client side with zero server processing.

I built .

For binaural beats with independent left/right ear frequency control, check out the Binaural Beats Studio.

Built with vanilla JavaScript, the Web Audio API, HTML5 Canvas, and Astro. No frameworks, no dependencies, no tracking.