KoalaSync — Marketing Copy Kit

Ready-to-paste copy for product listings, launch pages, directory submissions, and anywhere else you keep re-typing the same pitch. Three lengths, one consistent message. Pick the one that fits the field limit.

1. One-Sentence Pitch

KoalaSync is a privacy-first browser extension that synchronizes video playback across almost any website so you can watch with friends in real time — no accounts, no tracking, and your video never passes through anyone's server but the original site's.

Shorter alternative (for tight tagline fields):

Private, universal watch parties on any website — no accounts, no tracking, no media proxying.

2. Three-Sentence Overview

KoalaSync is a lightweight browser extension that keeps you and your friends perfectly in sync on YouTube, Netflix, Twitch, Prime Video, Jellyfin, Emby, and almost any other site with an HTML5 video player — press play once and everyone stays together. It's built privacy-first: no accounts, no telemetry, and the official relay server runs entirely in volatile RAM with zero persistence, so nothing about your sessions is ever stored. Open source under the MIT license and fully self-hostable with a single Docker Compose command, KoalaSync is a transparent watch-party tool that works everywhere and respects your data sovereignty.

3. Full Description

Watch together — on any site, on your terms.

Counting down "3, 2, 1, play" over voice chat doesn't scale past two people. KoalaSync fixes that with a tiny browser extension that synchronizes play, pause, and seeking across everyone in the room, on almost any website with a <video> element. Create a room, share a link, press play — that's it.

What makes KoalaSync different

Most watch-party tools fall into one of two traps: they only work on a short allowlist of sites (site-specific extensions that need a separate build for every platform), or they route your video through their own player and servers. KoalaSync was built around three principles that break that mold.

Universal by design. If the site has an HTML5 <video> element, KoalaSync can usually sync it. YouTube, Netflix, Twitch, Prime Video, Disney+, Jellyfin, Emby, and countless niche sites work out of the box — no per-site integration to wait for, no extension swap when your friends want to switch services.

Your video never touches our servers. KoalaSync only relays tiny timing messages — play, pause, seek position, readiness — over a hand-rolled WebSocket protocol. The actual video keeps streaming directly from the original site to each viewer's browser. KoalaSync never proxies, transcodes, uploads, or redistributes a single frame, which also means there is no legal gray zone around redistribution.

Privacy is the default, not an upgrade. No accounts, no emails, no telemetry, no analytics, no behavior profiling. The official relay server runs entirely in volatile RAM and keeps zero persistent state — when the room closes, the data is gone. Pick a nickname or let KoalaSync generate one for you and you're in.

Built for people who actually want to read the code

KoalaSync is MIT-licensed open source, built by a solo developer. Audit it, fork it, change it. The extension is dependency-free with a direct Socket.IO wire implementation — no opaque libraries, no framework bloat, no surprise third-party SDKs. Want full sovereignty? Set a unique SERVER_SALT in the supplied Compose file, then start your own relay with a single Docker Compose command and keep all watch-party coordination traffic inside your own infrastructure. The official public relay is there when you don't care, self-hosting is there when you do.

Little touches you'll notice

Episode Auto-Sync pauses the room when someone loads the next episode and resumes only when everyone is ready — no spoilers, no one left behind on the previous cliffhanger.
Smart Audio Compressor tames the modern "whisper dialogue, deafening explosion" mix with one click. Three presets or full manual control over threshold, ratio, attack, and release.
One-click invite links auto-configure the server and room for your friends — they just click the link and they're in. No fumbling with server URLs or room IDs.
Dual-heartbeat architecture kills ghost rooms and stale connections before they desync your session.
15 languages fully translated and switchable in real time from the settings panel — English, German, French, Spanish, Portuguese (Brazil + European), Russian, Italian, Polish, Turkish, Dutch, Japanese, Korean, Chinese, Ukrainian.

Install and start in under a minute

Install KoalaSync from the Chrome Web Store or Firefox Add-ons, click "Create Room," share the invite link, and pick a video. The official relay is ready out of the box — no setup required unless you want to self-host.

Website: https://sync.koalastuff.net
GitHub: https://github.com/Shik3i/KoalaSync

Watch together. Anywhere. Privately.
The watch-party tool that works on every site and tracks none of them.
Sync play, pause, and seek on any video — no accounts, no logs, no lock-in.
Self-hostable, open-source watch parties for the post-"3, 2, 1, play" era.
Press play once. Stay together anywhere.

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