Synchronize video playback on YouTube, Netflix, Emby, Jellyfin, and any HTML5 site in real-time with friends.

KoalaSync: The Privacy-First Watch Party Extension

Synchronize movies, series, and videos in real-time with friends.
100% free, secure, and no account required.

Whether you're binge-watching Netflix, streaming from your own self-hosted Emby, Jellyfin, or Plex servers, or watching on virtually any other website with a video player — KoalaSync keeps everyone perfectly in sync. Lightweight, open-source, and built for absolute data sovereignty.

✨ CORE FEATURES
• No Account Needed: Just create a room and share the link. No emails, no passwords, no hassle. A random nickname is assigned automatically, or pick your own.
• Universal HTML5 Sync: Flawlessly synchronizes play, pause, and seeking on Netflix, Jellyfin, Emby, YouTube, and almost any website hosting a standard HTML5 <video> tag.
• Smart Binge-Watching (Auto-Sync): 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 clicked, the extension instantly configures room credentials and server settings for your guests.
• Zero-Latency Protocol: Powered by a custom WebSocket architecture designed for real-time coordination without buffering loops.

🛡️ UNCOMPROMISING PRIVACY
No data collection. No compromises.
• 100% Anonymous: Zero tracking, zero analytics, zero telemetry.
• Ready Out-Of-The-Box: No technical knowledge needed. Install and start watching immediately using the official public server.
• RAM-Only Public Server: The official relay server operates entirely in volatile RAM. No databases, no logs, no watch history — nothing persists.
• Self-Hostable: Take total control by deploying a private relay server in seconds via Docker. Optional, never required.

🚀 HOW IT WORKS
  1. Install KoalaSync and click "Create Room" to spin up a secure lobby.
  2. Copy the invite link and send it to your friends.
  3. Open your favorite streaming site and set the video tab as the active target.
  4. Press play — everyone stays perfectly in sync.

💻 OPEN SOURCE
KoalaSync was built by a solo developer who needed a fast, secure way to watch movies with friends — and builds tools worth using. The code is fully transparent under the MIT license: audit it, fork it, improve it. Found a bug or have a feature idea? Open an issue on GitHub. Contributions and code reviews are always welcome.
• Website: https://sync.koalastuff.net
• GitHub: https://github.com/Shik3i/KoalaSync