spectracanvas
A free audio demo — play it in your browser, no install. Paint a spectrogram and hear it. Draw lines, curves, and shapes, or import an image, then listen as additive synthesis turns pixels into sound. Export WAV. Runs entirely in the browser, no dependencies, no uploads.
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Best with a keyboard. Controls: Shortcuts: B draw, E erase, Cmd/Ctrl Z undo, Esc stop
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Open the live demo Source on GitHubFrom the README
Paint a spectrogram, hear the drawing, export a WAV.
Runs entirely in the browser. No build step, no dependencies, no network.
Shortcuts: B draw, E erase, Cmd/Ctrl Z undo, Esc stop.
The canvas is a grid of 384 time steps by 128 frequency rows. Rows are spaced logarithmically between the chosen low and high frequencies.
Each row drives one sine oscillator. The pixel brightness along the row sets its volume over time. All 128 oscillators are summed, normalized, and given a short fade in and out.
The bottom panel is not a copy of your drawing.
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