Real hand gestures to play Flappy Bird, using doppler effect and microphone.
JavaScript CSS HTML
Switch branches/tags
Nothing to show
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.

Handy Bird

Play Flappy Bird by actually flapping your hands.

Play it now here:


  • Does not work in Firefox. Works well in Chrome.
  • Sound must be on and maximized. You may hear the high-pitched tone it uses. Best to use built-in laptop speaker.
  • Microphone access must be allowed. It listens to the change in the tone to detect motion.
  • Flap your hand toward your microphone. On Macbook it is by top-left of the keyboard. You may have to Google where it is on your computer.
  • The speaker or microphone on some computers may not be able to handle the 20kHz tone used for the doppler detection.


I was totally amazed by Daniel Rapp's demo that its possible to detect hand movement using the doppler effect in javascript. Given that I must make everything into a game, Flappy Bird was the obvious choice. Nebez Briefkani had already created a great javascript version, Floppy Bird. Excellent code in both projects enabled this mash-up.

Local Development

The microphone is not permitted files served from the filesystem. To develop on a local machine, you'll have to start a webserver. This should work:

python -m SimpleHTTPServer 8000