TurtleTV is described as 'Virtual watch parties on mobile and desktop' and is a Watch Videos Together Tool in the Video & Movies category. There are more than 25 alternatives to TurtleTV for a variety of platforms, including Online / Web-based, Windows, Mac, Linux and Google Chrome. The best alternative is Metastream, which is both free and Open Source. Other great apps like TurtleTV are StreamParty (Freemium), Syncplay (Free, Open Source), OpenTogetherTube (Free, Open Source) and Hyperbeam (Freemium).
Flickcall is a privacy-focused browser extension to watch movies & TV shows together. Your personal chats & video stream are delivered directly to peers. Supports Netflix, Youtube, Primevideo, Hotstar, & Zee5. It is like Netflix party with video-call.