WatchIt
Watch together in perfect sync: no accounts, no setup
About the project
For the people who can't be in the same room. Create a room, share a link and watch YouTube videos in perfect sync. One person presses play, everyone watches together; pause, seek and video changes stay in sync instantly. Under the hood: a React 19 progressive web app with Socket.IO-driven sync, and a stateless Node.js server with a custom handshake protocol for frame-accurate sync when someone joins mid-video.
Key features
- Rooms shared by link, with no accounts and no setup
- Play, pause, seek and video changes reach everyone in real time through WebSockets (Socket.IO)
- Frame-accurate sync for people joining mid-video, thanks to a custom handshake protocol
- Stateless Node.js/Express server: no room state to store, back up or migrate
- React 19 progressive web app with Redux Toolkit state management
- Live on Vercel
- The same real-time technology can power live order boards, shared views or live availability for a business
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