KoalaSync perfectly synchronizes video streams across multiple devices. It works universally with Netflix, YouTube, and any HTML5 player, but was specifically built to support self-hosted servers like Emby, Jellyfin and Plex. No accounts, no tracking. Features include TV show auto-syncing and smart tab matching. It's 100% free, open-source, and you can even self-host the WebSocket relay server for complete data privacy.
