KoalaSync.
KoalaSync is a free, open-source browser extension for remote watch parties.
Project overview
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.
Project facts
Project details
- Category
- Browser Extensions
- Type
- Watch-party browser extensionOfficial documentation · checked Sep 25, 2026
- Platforms
- Browser extensionOfficial documentation · checked Sep 25, 2026
- Pricing
- Free and open source.Official documentation · checked Sep 25, 2026
- Availability
- Available for Chrome and Firefox.Official documentation · checked Sep 25, 2026
- Published
- Jun 16, 2026
- Last updated
- Sep 26, 2026
Details come from the published Project Note and named sources. Check the project site for current terms. The Note may have more context when a fact isn't recorded here.
Before you visit
Good to know
Built for
- Long-distance couples, friends, and families watching video remotely
- Online communities running watch parties
- Plex, Jellyfin, or Emby users who prefer self-hosting
- It fits people who often watch movies, shows, or other videos with someone in another location.
- Self-hosting support also makes it relevant to people running Plex, Jellyfin, or Emby.
Requirements
- Use Chrome or Firefox and install the KoalaSync extension.
Official documentation · checked Sep 25, 2026
Related links
Profile tools
Building something useful?
Submit your project for free. If selected, it gets a profile that explains what it does and links to your work. Publication isn't guaranteed.
Submit a project