Not requiring any additional hardware because it works using a Mac's built-in webcam, Flutter registers hand gestures – well, a hand gesture – to control playback in iTunes and Spotify.

Google has acquired the startup Flutter, the creator of a motion-control app that turns your computer’s webcam into an “eye” that can detect your hand gestures and translate them into ...

“Kinect for OS X,” crows the company at the top of its iTunes Flutter app page, where for $4.99 you can download the hand gesture recognition app (it’s also available for Windows).