Sync Sofa is a Chrome extension developed by louis.yiliang.wang. It is a full stack web extension that allows for easy and stable synchronization of streaming playback for multiple users. The extension is designed to enhance the experience of sharing and watching videos remotely with friends or colleagues in different locations.

The main features of Sync Sofa include peer connection, where either party can be the host of a sync room and the other can join using a connection code. It also offers sync pause/play functionality, allowing each user to control the playback of the video for all users. The sync play process bar control ensures that changes in the playing time are reflected for all users. Additionally, Sync Sofa provides two ways to sync the playing of local video files and includes a built-in instant chat and video conference call feature for easy communication with peers.

Sync Sofa supports a variety of popular streaming sites, including YouTube, Bilibili, iQiyi, Youku, and Tencent Video, among others. It also allows for syncing of local mp4 files via the browser and local video files via VLC media player.

Overall, Sync Sofa is a useful and convenient tool for synchronizing video playback with multiple users, making it easier to watch videos together remotely.