Kast is described as «social sharing platform where users can stream content from their computer to the people in their channel (called parties). Kast parties allow up to 20 people to share their screens and up to an additional 100 people to view in the party» and is a watch videos together tool in the social & communications category. There are more than 25 alternatives to Kast 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 Kast are OpenTogetherTube, Hyperbeam, Syncplay and Watch2Gether.Kast alternatives are mainly Watch Videos Together Tools but may also be Group Chat Apps or Video Streaming Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Kast.