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Play a theremin with your mouse — pitch and volume by position, live in the browser.
Move horizontally for pitch, vertically for volume. Turn on a scale to snap to musical notes.
Theremin — Mouse Synth lets you play pitch (left/right) and volume (up/down) by moving your mouse or finger, with selectable waveforms and an optional snap-to-scale. It’s built on the Web Audio API and runs entirely in your browser.
Play a theremin-style instrument with your mouse or finger. Move left and right to change pitch and up and down to change volume, gliding smoothly between notes for that eerie, sci-fi theremin sound. Switch waveforms (sine, triangle, square, sawtooth), turn on “snap to scale” to lock to a musical scale, and set the octave range. It’s a fun, hands-on synth that uses the Web Audio API — no plugins, no downloads, and it runs entirely in your browser.
Theremin — Mouse Synth provides an accessible, browser-based way to explore theremin-style sound manipulation using basic mouse or touch movements. It requires zero downloads or plugins, utilizing the Web Audio API for immediate in-browser playback. Users can adjust waveforms, octave ranges, and enable snap-to-scale features for easier musical navigation without setting up complex digital audio workstations.
Good to know: This tool is designed for lightweight, real-time browser performance and may not suit advanced multi-track music production or professional scoring workflows.
Learn how to play the theremin in your browser by controlling pitch and volume with your mouse movements.
Open the online theremin synth tool
Navigate to the Theremin — Mouse Synth in your web browser to load the Web Audio API instrument instantly.
Select your preferred waveform type
Choose between sine, triangle, square, or sawtooth waveforms to customize the sound of your instrument.
Configure the octave and scale settings
Set your desired octave range and optionally enable the 'snap to scale' feature to lock notes to a musical scale.
Play notes by moving your mouse
Move your mouse or finger left and right to change the pitch, and up and down to adjust the volume smoothly.
Estimated time: PT1M
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