Currently version 0.1, it works but its rough. It's meant to be run by an emby server owner, as it requires a server api key. It essentially reads the room leader's location, jumps room members to 10-ish seconds ahead of the room leader, and finally unpauses roughly in sync.
Tested clients: iOS, Android, Amazon Fire devices, and the web player. Also working, but only as a stream or room leader, not as a follower: Chromecast and Roku. (Supposedly these devices may work as a following pla