YouKey is a free Chrome extension developed by simongloor. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This extension is designed to enhance your experience while watching YouTube videos by synchronizing your keyboard with the playing video.

With YouKey, you can easily figure out what key a song is in by keeping your keyboard in sync with the video. This feature is especially useful for musicians and music enthusiasts who want to play along with their favorite YouTube creators. Simply plug in your keyboard and let YouKey do the rest.

In addition to keyboard synchronization, YouKey also provides the convenience of opening the video in a new YouKey tab with just a simple click of the extension. This allows for a seamless transition between watching the video and playing along.

Overall, YouKey is a valuable tool for musicians and music lovers who want to enhance their YouTube experience by synchronizing their keyboard and easily determining the key of a song. It is a free extension that can be easily installed on Chrome.