Window Cannon
A ball physically rolls off one monitor and flies across the gap onto your second screen — because the page knows your real display layout.
Drag to aim & fling the ball. It rolls across the gap into the other window. Keep this window open.
A comet trail behind the ball. Auto-disabled when your system prefers reduced motion.
🪟 One ball, many windows
A single physics simulation lives in virtual-desktop coordinates. Each window draws only the slice of that world it sits over. Open a second window and watch the same ball roll off this screen and reappear in the other — across the gap between your monitors.
100% on-device — no servers, no uploads. Windows talk over BroadcastChannel. Multi-monitor positioning works best in desktop Chrome / Edge with the Window Management permission.
Why you’ll love Window Cannon
Instant & free
No signup, no paywall, no limits — Window Cannon works the moment the page loads.
Completely private
Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Endlessly playable
Designed to make you lose track of time — and come back for more.
How to use it
Open it
No download and no login — the tool is ready right at the top of this page.
Use it
Enter your details or start interacting. Everything updates live as you go.
Get your result
Copy, download or share your result in a single tap. That’s it.
About Window Cannon
Window Cannon is a browser-based toy that demonstrates dual screen physics in action. If you have a multi-monitor setup, launch the tool and watch as a ball physically rolls off one monitor and flies across the gap onto your second screen. The page automatically detects your real display layout using the Window Management API, calculating exactly where your screens meet so the ball transitions smoothly between them.
This cross screen ball demo showcases the practical capabilities of modern web APIs. It's a free window management API demo that runs entirely in your browser—no installation, no signup required. Your data never leaves your device, since all the physics calculations and screen detection happen locally. It's perfect for exploring how web technology can interact with your hardware configuration in ways that were previously impossible.
The physics engine smoothly animates the ball's journey as it leaves one display and enters another, creating an intuitive visualization of how your monitors are positioned. This toy is best experienced on a dual or multi-monitor setup, but even single-screen users can appreciate the underlying technical demonstration of the Window Management API in action.
Popular uses
Frequently asked questions
Window Cannon uses the Window Management API to detect your actual display layout. When you launch the tool, it identifies where each monitor is positioned relative to others, then calculates the exact point where the ball should transition between screens. This real-world screen data is what makes the physics simulation accurate to your specific setup.
Just a web browser and ideally a multi-monitor setup. Window Cannon runs entirely in your browser with no signup, installation, or downloads needed. If you have a single monitor, you can still view the demo, though the cross-screen ball effect is designed for dual or multi-monitor configurations.
Yes, your data is completely safe. Window Cannon runs locally in your browser, so all screen detection and calculations happen on your device. Nothing is sent to any server, and the tool doesn't store or track your monitor configuration.
It's a fun, interactive demonstration of how modern web APIs can understand your hardware setup. Whether you're curious about the Window Management API, want to see physics applied across physical screens, or just enjoy interactive browser-based toys, Window Cannon offers a unique experience that's only possible with multiple displays.
Window Cannon is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
Never. Just open it and play — no signup, no installs, nothing to lose.
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