Say you’re sitting at your laptop, listening to music while responding to emails, writing code, or reading blogs. Then your phone rings, and the typical scramble ensues: You minimize your browser, maximize your music app, and search frantically for the pause button or volume control — all, hopefully, before you miss the call. Sound familiar? That’s a problem that Flutter, a startup in Y Combinator’s latest batch of companies, has solved.

Flutter is an app for Mac that lets you control the play function on Spotify or iTunes by simply waving at your computer. You can watch it in action in the video embedded above. That in itself is pretty nifty — as evidenced by the 11,000 people who downloaded Flutter in the first 11 days it was available, and the 400,000 gestures the app logged from those users. In the near-term, Flutter expects to expand its functionality to control other media apps such as Pandora and YouTube, as well as to other operating systems and devices beyond the Mac.

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