KoalaSync

Tracking since May 23, 2026.

Changelog

• Jun 11, 2026
  description

  KoalaSync: The Privacy-First Watch Party Extension
  
  Private watch parties for Emby, Jellyfin, Plex, Netflix, YouTube & more. No account needed. Real-time sync. Supports 13 languages. 100% free.
  
  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 with a clean, minimalist UI.
  
  ✨ 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.
   • Fully Localized: Enjoy a native experience with a user interface fully translated into 13 different languages.
   • 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 & SECURITY 
  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. It also features built-in rate-limiting and brute-force protection to prevent room-id spamming.
  • 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

  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.
  • 13 Languages: Enjoy a native experience with a fully translated user interface.
  
  
  
  🛡️ 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.
  
  • Real-Time Relay: Playback state is synchronized through a custom WebSocket-based relay server for fast room updates.
  • 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

• Jun 5, 2026
  description

  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

  KoalaSync: The Privacy-First Watch Party Extension
  
  Private watch parties for Emby, Jellyfin, Plex, Netflix, YouTube & more. No account needed. Real-time sync. Supports 13 languages. 100% free.
  
  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 with a clean, minimalist UI.
  
  ✨ 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.
   • Fully Localized: Enjoy a native experience with a user interface fully translated into 13 different languages.
   • 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 & SECURITY 
  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. It also features built-in rate-limiting and brute-force protection to prevent room-id spamming.
  • 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

• Jun 5, 2026
  short_description

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

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

Permissions & access

Permissions

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Host access

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Screenshots