v1.5.3 OUT NOW v1.5.3 JETZT VERFÜGBAR

Watch Together.
Sync Perfectly.

Your remote movie night without lags. No registration, no data collection. Just share a link and watch together.

A cute koala standing and looking down at the download buttons
KoalaSync LogoKoalaSync
v1.9.3
Active RoomAktiver Raum brave-eagle-80
Official ServerOffizieller Server
Invite LinkEinladungs-Link
Peers in RoomTeilnehmer im Raum
CoolUsername YOUICH
🎬 Stranger Things - S4E1
0:55 • PlayingWiedergabe
KoalaPC PeerPartner
🎬 Stranger Things - S4E1
0:55 • PlayingWiedergabe
Jump to OthersZu anderen springen
PAUSE CoolUsername @ 12:44:32
🐨 KoalaPC
Episode Lobby
🎬 Stranger Things - S4E2
Waiting for 1 peer (KoalaPC)...Warten auf 1 Partner (KoalaPC)...
CoolUsername YOUICH
🎬 Stranger Things - S4E1
0:55 • PlayingWiedergabe
KoalaPC PeerPartner
🎬 Stranger Things - S4E1
0:55 • PlayingWiedergabe

Use this if you see "Duplicate Identity" errors. Nutze dies bei "Duplicate Identity" Fehlern.

ConnectedVerbunden
readyState: HAVE_ENOUGH_DATA
seekDelta: 0.05s
buffered: 300.2s
engineState: SYNCED
CoolUsername: PAUSE 0:55
KoalaPC: PLAY 0:00
[18:37:32] EVENT: PLAY -> ACK
[18:37:32] FORCE_SYNC -> 0.05s diff
[18:37:38] EVENT: PAUSE -> BROADCAST
[18:37:42] content_heartbeat: active
A cute koala juggling multiple browser tabs showing streaming platforms

Works on your favorite platforms

Perfect for Any Occasion

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

Two cute koalas sitting together and sharing a bucket of popcorn

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.

A koala professor presenting on a screen to two remote student koalas

Remote Learning

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

A cute koala couple watching together remotely; one is sitting at a PC and the other is in bed with a laptop, with flying hearts between them

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.

A cute koala with a question mark above its head wondering why to choose KoalaSync

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.

A cute koala weighing options in both hands to compare KoalaSync vs Teleparty

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]

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 Extension
KoalaSync
Privacy-first video synchronizer
Chrome Logo Download for Chrome
Firefox Logo Download for Firefox
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 Logo KoalaSync
v1.9.3
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.

A cute koala sitting at a laptop deploying a Docker container for self-hosting
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
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
    }
    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
}

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.

A cute koala holding a GitHub repository page next to the GitHub mascot Octocat