About
System Audio Visualizer is a free, browser-based tool that transforms your system audio into immersive, GPU-powered visual experiences. Whether you are listening to music, watching a video, or on a call, the visualizer captures audio in real time and renders reactive graphics at 60fps — all without leaving your browser.
Why We Built This
Audio visualization has a rich history, from Winamp's iconic plugins to modern VJ software. But most tools require downloads, complex setup, or expensive licenses. We wanted to bring that experience to the web — free, instant, and accessible to everyone with a modern browser.
By leveraging modern web APIs — the Screen Capture API for audio, the Web Audio API for analysis, and WebGL with GLSL shaders for rendering — we created a visualizer that rivals native applications in visual quality and performance.
Technology
The visualizer is built with a modern, performance-first web stack:
- Next.js 14+ with the App Router for server-rendered content pages and client-side interactive features.
- Web Audio API with AnalyserNode for real-time FFT frequency analysis and beat detection.
- Three.js and WebGL for GPU-accelerated rendering of custom GLSL shaders.
- TypeScript throughout for type safety and maintainability.
- Tailwind CSS for a consistent, responsive design system.
Privacy
All audio processing happens entirely in your browser. No audio data is ever recorded, stored, or sent to any server. The screen share permission is used solely to access the audio stream for visualization. We respect your privacy and believe creative tools should never compromise it.
Open and Accessible
System Audio Visualizer is free to use with no sign-up required. We support all major modern browsers, with the best experience on Chrome and Edge. The application is designed to be accessible, with proper semantic HTML, ARIA labels, and keyboard navigation support.
Creator
Built by Rojan Acharya. Get in touch via the contact page.