You can now play a Theremin in your browser with just a webcam

You can now play a digital Theremin in your browser using only a webcam and hand gestures.

A web tool named Air Theremin turns your camera or phone sensors into a real-time synth. Raising your hands changes the pitch, spreading them alters the volume, and leaning back softens the tone. If you are on a phone, tilting the device controls the sound, while computers without a camera can fall back on a standard mouse.

Why it matters: It shows how fast browser-based motion tracking has become on ordinary consumer hardware without adding plugins. The lightweight project picked up steam on Hacker News, earning 233 points and 81 comments.

Here's the gist: open the page, press Start, and wave both hands at the screen. Put your palms together whenever you need instant silence, or hold your phone steady at launch to calibrate its grip.

Your neighbors might hate it, but your webcam has never been this entertaining.