Let's get you set up.
To feed the visualizer audio you'll have to share your screen. Click Share System Audio and choose your Spotify tab. No screen content is used, only the audio stream.
Why do you need to share your screen?
Spotify removed real-time audio data from their API in 2024, so the visualizer
needs to hear your audio directly. Screen sharing is the only way browsers can
capture system audio. No audio data is ever processed, stored, or transmitted —
everything runs locally in your browser.
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Play something on Spotify
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