KoalaSync

Watch party extension to synchronize video playback on YouTube, Twitch, Netflix, and HTML5 sites in real-time with friends.

KoalaSync: The Privacy-First Watch Party Extension Synchronize movies, series, and videos in real-time with friends—no accounts, no tracking, no lag. Whether you're binge-watching Netflix, catching a Twitch stream, or using custom self-hosted platforms like Emby, Jellyfin, and Plex, KoalaSync keeps everyone perfectly in sync. Lightweight, open-source, and built for absolute data sovereignty. ✨ CORE FEATURES • Universal HTML5 Sync: Flawlessly synchronize play, pause, and seeking on YouTube, Netflix, Disney+, and virtually any website with a standard video player. • Smart Binge-Watching (Auto-Sync): The ultimate series coordinator. When a new episode loads, KoalaSync automatically pauses playback in a smart lobby until everyone’s video is ready. No spoilers, no one left behind. • One-Click Invitations: Generate a smart invite link. Once your friends click it, their extension instantly configures the room credentials and server settings. • Zero-Latency Protocol: Powered by a custom WebSocket architecture designed for frame-perfect, real-time coordination without buffering loops. 🛡️ UNCOMPROMISING PRIVACY Built by developers who care about security. We don't want your data. • 100% Anonymous: No accounts required, no tracking, and zero analytics. • Zero Persistence: Our official public relay server operates entirely in volatile RAM. No databases, no logs, no watch history. • Self-Hostable: Take total control. Deploy your own private relay server in seconds using Docker and connect your extension with a single click. • Pure Performance: Built with clean, dependency-free Vanilla JS to keep your browser fast and resource-friendly. 🚀 HOW IT WORKS (IN 3 SECONDS) • Open the KoalaSync popup and pick a nickname. • Click "Create Room" and copy the invite link. • Send the link to your friends, start a video, and watch together perfectly synced! 💻 OPEN SOURCE & SUPPORT KoalaSync is completely free, open-source, and MIT-licensed. Want to self-host, audit our code, or contribute? Visit us on GitHub: https://github.com/Shik3i/KoalaSync