KoalaSync
A free, open-source browser extension that keeps remote video playback in sync, with no account required and optional self-hosting.
Project links
Project Note
A closer look at KoalaSync
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.
What caught my eye
KoalaSync solves a recognizable annoyance without asking people to adopt a full social platform. The open-source code, no-account setup, and optional relay hosting give technically inclined users more control. Compatibility across many video services is the key promise, so prospective users should confirm the sites and browsers they plan to use.
How KoalaSync works
KoalaSync creates a shared room for people watching the same browser video. It synchronizes playback actions such as pausing, seeking, skipping, and changing episodes.
The project supports invite links, says no account is required, and offers an optional self-hosted relay.
Who might find it useful
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.
Closing context
KoalaSync has one focused job. It keeps a remote watch party synchronized without requiring another account.
Its real-world fit comes down to current support for the services and browsers a group uses.
For reference
Project facts
The published details and source context, together in one place.
- Product
- KoalaSync
- Category
- Browser Extensions
- Stage
- Launched
- Pricing
- Free and open source.
Pricing source: Official documentation · checked Sep 25, 2026
- Public Context Check
- Published June 16, 2026. The public page lists the stage as Launched and the price as Free. Founder Timo is publicly named on the note.
- Founder Feedback
- The public note does not report hands-on compatibility testing for each listed service.
Project note details
Dates and editorial links
Published
June 16, 2026
Updated
September 26, 2026
Page type
Project Note
Status
Published note
Publication history
Note history
Publication and substantive update dates for this public note.
- Jun 16, 2026
- Project note published.
- Sep 26, 2026
- Project note updated.
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