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Works on your favorite platforms

Netflix
YouTube
Twitch
Prime Video
Jellyfin
Emby
+ and many more
Works on almost any site with a video element

## Perfect for Any Occasion

Whether near or far, KoalaSync brings people together around their favorite videos.

### Movie Night with Friends

Sync your movies in real time and talk via Discord, Zoom, or your favorite voice call application. It feels just like sitting in the same room.

### Remote Learning

Analyze online tutorials, lectures, or developer training streams together with classmates or colleagues. Pause and discuss complex steps in perfect harmony.

### Long-Distance Relationships

Bridge the distance and enjoy date nights. Experience every plot twist, laugh at the same jokes, and share emotional moments at the exact same millisecond.

## Why KoalaSync?

Built for reliable sync, privacy-first design, and easy setup.

###
Full Control / Instant Sync

One pauses, everyone pauses. One seeks, everyone follows. Our two-phase sync protocol coordinates playback in real time across all participants.

###
Endless Binge-Watching

Autoplay in sync. KoalaSync automatically detects episode transitions and holds playback until all peers have successfully loaded the next video.

###
Zero Accounts / Pure Privacy

No registration, no tracking, no persistency footprints. The server runs entirely in ephemeral RAM and purges your room when you leave.

STATE: VOLATILE RAM-ONLY

###
Universal HTML5 Support

Works on YouTube, Twitch, Netflix, Jellyfin, Emby, and almost any standard webpage containing a HTML5 video element. Also compatible with custom self-hosted setups.

###
Instant Invites / 1-Click Join

No IP addresses or passwords to exchange. Share a generated invite link with your friends to let them join your room automatically with a single click.

###
Self-Hostable & Docker-Ready

Our official servers are free and fast, but you can take full ownership if you want to. Launch your own private relay server in seconds via Docker.

## KoalaSync vs. Teleparty

See why open source, ad-free and privacy-first is the superior way to watch together.

Feature | KoalaSync | Teleparty
--- | --- | ---
Cost / Paywalls Premium subscriptions, hidden fees or locked features. | ✔ 100% Free | ✘ Paid Tiers / Premium Locks [1]
License / Code Auditable Whether the source code is open and freely auditable. | ✔ Open Source (MIT) | ✘ Proprietary [2]
Self-Hosting Ability to deploy your own private relay server. | ✔ Yes (Docker-ready) | ✘ No [2]
Privacy & Tracking Registration requirements, tracking cookies and analytics. | ✔ Zero-Persistence (RAM-only) | ✘ Google Analytics & Cookies [2]
Site Compatibility Supported websites and player compatibility. | ✔ Almost any HTML5 Video[3] | ✘ Supported sites only [1]
Localization / Translation Available interface languages and translation support. | ✔ 13 Languages (and growing) | ✘ English only

Comparison state: May 2026.

[1] Official Teleparty Premium pricing and supported networks details: teleparty.com/premium

[2] Teleparty privacy policies and tracking data collection: teleparty.com/privacy

[3] Works on websites that allow script injections into standard HTML5 video tags. Websites with highly strict Content Security Policies (CSP), DRM copy protection, or heavily obfuscated player wrappers (like complex shadow DOMs) might restrict automated control or injection.

## Getting Started

01

### Install Extension

Add KoalaSync to your browser from the Chrome Web Store, Firefox Add-ons, or download the latest developer ZIP from GitHub.

https://sync.koalastuff.net
KoalaSync
Privacy-first video synchronizer
Download for Chrome
Download for Firefox
KoalaSync
Extension Active
Ready to watch together!
02

### Create a Room

Open the extension popup and click '+ Create New Room'. KoalaSync automatically generates a secure Room ID and Password, joins it, and copies the invite link to your clipboard.

KoalaSync
2.2.0
Room
Sync
Settings
+ Create New Room
▶ Manual Connect / Advanced
Invite link copied!
03

### Share & Sync

Send the invite link to your friends. Once they join, select your video tab and enjoy synchronized playback.

🐨 KoalaPC PLAYING
▶
⏸
42:15
IN SYNC
💻 LaptopKoala PLAYING
▶
⏸
42:15

## For Self-Hosters

Don't trust our server? Maintain full data sovereignty. Deploy your own private relay server in minutes.

    services:
      koala-sync:
        image: ghcr.io/shik3i/koalasync:latest
        container_name: KoalaSync
        restart: always
        # Access internally by proxying to container port 3000
        environment:
          - TZ=Europe/Berlin
          - PORT=3000
          - MIN_VERSION=1.0.0
          - MAX_ROOMS=100
          - MAX_PEERS_PER_ROOM=50
        pids_limit: 2048

View all image tags on GitHub Packages →

    sync.koalastuff.net {
        root * /var/www/koalasync/website/www
        encode zstd gzip

        # Clean URLs support (no .html required)
        try_files {path} {path}.html {path}/
        file_server
    }

    syncserver.koalastuff.net {
        reverse_proxy localhost:3000
    }

    (security_headers) {
        header {
            # Enable HTTP Strict Transport Security (HSTS)
            Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"
            # Prevent clickjacking attacks (Sameorigin)
            X-Frame-Options "SAMEORIGIN"
            # Prevent MIME-sniffing
            X-Content-Type-Options "nosniff"
            # Enable browser XSS protection
            X-XSS-Protection "1; mode=block"
            # Control referrer information
            Referrer-Policy "strict-origin-when-cross-origin"
            # Hide Caddy server stamp signature
            -Server
        }
    }

    sync.koalastuff.net {
        encode zstd gzip
        root * /var/www/koalasync/website/www

        # Clean URLs: Resolves paths without .html in the URL
        try_files {path} {path}.html {path}/
        file_server

        # Static Caching for high performance
        @static {
            file
            path *.ico *.css *.js *.png *.svg *.webp *.avif
        }
        header @static Cache-Control "public, max-age=31536000, must-revalidate"

        # Hardened Security & Permission Policies
        import security_headers
        header {
            Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; connect-src 'self'; img-src 'self' data:; object-src 'none'; frame-ancestors 'none'; base-uri 'none'; form-action 'none';"
            Permissions-Policy "camera=(), microphone=(), geolocation=(), payment=(), usb=()"
        }
    }

    syncserver.koalastuff.net {
        import security_headers
        encode zstd gzip
        reverse_proxy KoalaSync:3000
    }

## Frequently Asked Questions

Everything you need to know about watching videos together in perfect sync.

Can I watch Netflix, Emby or Jellyfin together in sync with friends?

Yes! KoalaSync works on Netflix, YouTube, Twitch and any website with an HTML5 video player — including Emby, Jellyfin and self-hosted media servers. Install the extension, create a room, share the invite link, and everyone watches in perfect sync.

Is KoalaSync a free alternative to Teleparty?

100% free and open source under the MIT License. No premium tiers, no locked features, no ads — everything is included. Unlike Teleparty, KoalaSync's relay server is RAM-only with zero data collection or user accounts required.

Does KoalaSync work with Emby, Jellyfin and self-hosted media servers?

Yes. KoalaSync detects any standard HTML5 video element, which means it works perfectly with Emby, Jellyfin, Plex, and any custom self-hosted streaming setup. You can also self-host the KoalaSync relay server via Docker for complete data sovereignty.

Which browsers and platforms support KoalaSync?

Google Chrome, Mozilla Firefox, Microsoft Edge, Opera, Brave, and all Chromium-based browsers. Install it directly from the Chrome Web Store or Firefox Add-ons — no manual configuration needed.

Do all my friends need the extension installed?

Yes, each participant needs KoalaSync installed — but there's no sign-up or account creation. Simply click the invitation link, install the extension if you haven't already, and you'll join the room automatically in seconds.

Is my data safe? What if I don't trust the official server?

Completely safe. KoalaSync's relay server is RAM-only — all session data is permanently deleted the moment you leave the room. No database, no logging, no analytics, no accounts. And if you prefer full control: you can self-host your own private relay server via Docker in minutes. The entire codebase is open source and auditable on GitHub.

## Not convinced? See for yourself.

KoalaSync is 100% open source, ad-free and tracking-free. Audit our codebase on GitHub or install the browser extension directly.

Add to Chrome Add to Firefox
GitHub