KoalaSync: Private Watch Parties for Emby, Jellyfin, Plex, Netflix & YouTube

Tired of counting down "3, 2, 1, Play" over voice chat? KoalaSync keeps you and your friends perfectly in sync. Whether you are streaming from your own self-hosted media server like Emby, Jellyfin or Plex, or watching on a major platform like Netflix, Prime Video or YouTube, KoalaSync is designed for smooth, browser-based watch parties.


✨ CORE FEATURES
No account required. No tracking. Just create a room, invite your friends, and start watching together.

• Real-Time Video Sync: Play, pause, seek, and watch together with fast synchronized playback across everyone in your room.
• No Account Needed: Create a room and share the invite link. No emails, no passwords, no sign-ups. Pick a nickname or let KoalaSync generate one for you.
• Works Almost Everywhere: If the website uses a standard HTML5 video player, KoalaSync can usually sync it. Perfect for streaming sites, self-hosted media servers, and other websites.
• Smart Binge-Watching: When a new episode loads, KoalaSync automatically pauses the lobby until everyone is ready. No spoilers, no one left behind.
• Smart Audio Compressor: Tired of quiet dialogue and suddenly loud action scenes? Balance whispering, explosions, and music with a single click while you watch.
• One-Click Invites: Send a smart invite link to your friends. When they open it, KoalaSync automatically configures the room so they can join instantly.
• 15 Languages: Enjoy a native experience in English, German, French, Spanish, Brazilian and European Portuguese, Russian, Italian, Polish, Turkish, Dutch, Japanese, Korean, Simplified Chinese, and Ukrainian.



🛡️ PRIVACY & SECURITY
KoalaSync is built for private watch parties without unnecessary data collection.

• No Tracking: Zero analytics, zero telemetry, and absolutely no behavior profiling.
• Anonymous by Design: No accounts needed. Rooms can be joined with a simple nickname.
• Ready Out of the Box: Install KoalaSync and start watching immediately using the official public relay server. No technical setup required.
• RAM-Only Public Server: The official relay server operates entirely in volatile RAM. No databases, no stored watch history, no persistent room data. Room data exists only temporarily and disappears when the room closes.
• Self-Hostable: Want full control? You can run your own private KoalaSync relay server via Docker in seconds. Self-hosting is optional and never required.



🚀 HOW IT WORKS
1. Install KoalaSync.
2. Click "Create Room" to start a private watch party.
3. Share the invite link with your friends.
4. Open your favorite streaming site or media server.
5. Select the active video tab.
6. Press play. Everyone stays perfectly in sync.



⚙️ UNDER THE HOOD
KoalaSync is lightweight, transparent, and built with privacy in mind.

• On-Demand Relay: Playback state is synchronized through a custom WebSocket-based relay server. There is no permanent background connection. The relay connection is maintained only while you're in a room and closes when you leave or automatically after two hours without a selected-video heartbeat.
• No Media Streaming: KoalaSync does not stream, proxy, upload, download, or redistribute any video content. Everyone watches from their own browser on the original website.
• Temporary Room State Only: The relay server only coordinates room state such as play, pause, seek position, active target, nickname, and readiness status.
• Docker Self-Hosting: The relay server can be self-hosted with Docker if you prefer to run your own private instance.
• Open Architecture: The project is designed to be inspectable, forkable, and easy to review.



💻 OPEN SOURCE
KoalaSync was built by a solo developer who needed a fast, secure way to watch movies with friends. The code is fully transparent under the MIT license: audit it, fork it, improve it, or self-host your own relay server.

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
