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KoalaSync

Release Status GitHub release License Firefox Add-on Chrome Extension

KoalaSync is a lightweight Browser Extension and Relay Server for synchronized video playback on almost any website with a video elementβ€”YouTube, Twitch, Netflix, Emby, Jellyfin, and beyond. Built with a focus on Data Sovereignty and Performance.

New v2.5.0 Release! β€” See what's changed

### 🌟 Why KoalaSync? * **πŸ›‘οΈ Security-First**: Volatile RAM-based relay with built-in brute-force protection and zero-persistence architecture. We keep no logs of your sessions or synchronizations. *We don't track you. We only track our server* (relying on the [aggregated, anonymous, non-personal metrics](https://syncserver.koalastuff.net/health) provided under `/health`). * **πŸ“‘ Direct Logic**: Manual Socket.IO wire implementation for reliable synchronization. * **πŸ› οΈ Clean Build**: Dependency-free extension runtime with no library overhead. * **🌐 Universal**: Works on any website with a `