I experimented with making one for Spotify. You can control the desktop player with the undocumented WebHelper API. http://cgbystrom.com/articles/deconstructi

I experimented with making one for Spotify. You can control the desktop player with the undocumented WebHelper API. http://cgbystrom.com/articles/deconstructing-spotifys-builtin-http-server/ http://cgbystrom.com/articles/deconstructing-spotifys-builti... Me and a friend could run a custom node.js script locally and control each other's players. However I never figured out half the polish OP did to get sync really tight, nor packaged and published my solution.