KoalaSync.
A free, open-source browser extension that keeps remote video playback in sync, with no account required and optional self-hosting.
Structured discovery note
The short version
KoalaSync is a free, open-source browser extension for remote watch parties. One person creates a room and shares an invite link. The extension keeps play, pause, seeking, and episode changes synchronized across supported browser players. The public note names Emby, Jellyfin, Plex, YouTube, Netflix, Disney+, and Prime Video among its supported services. The project says it requires no account, does not track users, and can use a self-hosted relay server.
Sourced project facts
At a glance
- Category
- Browser Extensions
- Stage
- Launched
- Platform
- Browser extension
- Pricing
- Free
- Published
- Jun 16, 2026
- Last updated
- Aug 28, 2026
Only details present in the published Project Note are shown here. Check the official project for current terms.
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