SyncTube is described as 'A simple platform where you can create rooms, manage permissions and chat while watching YouTube videos synchronized with your friends' and is an website in the Video & Movies category. There are more than 10 alternatives to SyncTube, not only websites but also apps for a variety of platforms, including Windows, Mac, Firefox and Google Chrome. The best alternative is StreamParty, which is free. Other great sites and apps similar to SyncTube are Watch2Gether (Freemium), Kosmi (Free), CyTube (Free, Open Source) and Sync Video (Free).
Watch2Gether lets groups of users watch videos in-sync together. At the same time users can communicate through a build-in chat-room and use web cam and audio chat. Available media sources are Youtube, Vimeo, Dailymotion and Soundcloud.
Kosmi is a free real time application and communication platform that offers voice, text and video calls along with games and applications such as SNES Party, NES Party, OpenArena, Poker, Virtual Cardtables, Synced YouTube and Cowatch Video.