Watch the same video across devices, perfectly synced
Sub-50ms accuracy. Zero hardware. Any browser.
Everything you need for perfect sync
Built on real-time signal processing, not just timestamps. Every feature is designed for sub-50ms accuracy.
Sub-50ms Sync
Kalman filter estimates drift, PID controller corrects it. Your devices stay locked together with sub-50ms accuracy.
Any Device
Web, desktop, Android, iOS. If it has a browser, it can sync. Mix and match freely.
Simple Room Codes
Share a memorable code like "happy-panda-42". No accounts needed for guests, no complicated setup.
Audio Offset
Compensate for speaker delay on each device independently. Perfect lip-sync across your whole setup.
No Hardware Needed
No dongles, no Chromecast, no Apple TV. Just open a URL and you are synced.
Free Tier
Sync 2 devices for free, forever. No credit card, no trial expiration. Just sign up and go.
How it works
Three steps. Under a minute. No hardware required.
Create a Room
Sign in and create a sync room with one click. You become the host.
Share the Code
Send your room code to other devices or friends. They join instantly.
Press Play
Hit play on the host device. Every connected screen follows in perfect sync.
Built for every scenario
From living rooms to lecture halls, Watch in Sync keeps every screen together.
Multi-Screen Setup
Control YouTube on your TV from your laptop. One host, every screen in sync.
Watch Parties
Sync with friends across the world. Same video, same moment, no countdown needed.
Classrooms
Teachers sync a video to every student screen. No more "is everyone at 3:42?"
Houses of Worship
Multi-campus video sync for services. Every overflow room, every campus, perfectly together.
Digital Signage
Retail displays, lobby screens, event walls. All playing the same content in lockstep.
Simple pricing
Start free. Upgrade when you need more.
Free
Get started with basic sync
- 2 devices per room
- 1 active room
- 24-hour room duration
- Sub-50ms sync accuracy
- All device types supported
Pro
Unlimited sync for power users
- Unlimited devices per room
- Unlimited active rooms
- Permanent rooms
- Priority sync server
- Audio offset controls
- Early access to new features
Frequently asked questions
Everything you need to know about Watch in Sync.
Ready to sync?
Start syncing your devices in under a minute. Free forever for up to 2 devices.