KoalaSync by HungryKoala
Watch party extension to synchronize video playback on YouTube, Twitch, Netflix, and HTML5 sites in real-time with friends.
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About this extension
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
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
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Permissions and data
Required permissions:
- Display notifications to you
- Access browser tabs
- Access your data for sync.koalastuff.net
Optional permissions:
- Access your data for all websites
Data collection:
- The developer says this extension doesn't require data collection.
More information
- Add-on Links
- Version
- 1.5.1
- Size
- 74.24 KB
- Last updated
- 4 days ago (May 18, 2026)
- Related Categories
- License
- MIT License
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
- Add to collection