Joinwall: LED Sign Wall

One phone is too small to read across a concert or an arrivals hall. Joinwall links your friends' phones into one long LED sign, with letters that run from screen to screen. Friends don't need to install the app: they scan your QR code with the iPhone camera and become the next panel in seconds. HOW IT WORKS • Type a message, or draw your own sign on the dot grid • Tap Make a wall and show the QR code • Friends scan it, line their phones up side by side, and you tap Start • Letters keep the same real-world size on every phone and iPad, because Joinwall works in millimetres WORKS ANYWHERE • Online: each phone can use its own mobile data, no shared Wi-Fi needed • No internet: phones connect nearby over Wi-Fi and Bluetooth • A phone that drops out doesn't stop the sign; the others keep running A GREAT SINGLE SIGN TOO • Full-screen sign in one tap: max brightness, stays awake, locks to landscape • Save your signs and bring them back instantly • Pin a sign to the Lock Screen and Dynamic Island while you wait at the gate • StandBy desk sign while your iPhone charges • "Hey Siri, show a sign with Joinwall" • iPad: a big panel in the wall, or a shop-window sign of its own SAFE BY DESIGN Nothing flashes faster than 3 times a second, on every tier, and Reduce Motion is respected. JOINWALL PRO, ONE-TIME $2.99 • Link as many phones and iPads as you can line up (free walls use 2 screens) • All six LED colors • Static, bounce, pulse and flash effects • Smaller dots for longer messages • Unlimited saved signs and drawings Buy once, keep it forever. No subscription, and no ads with Pro. PRIVACY No account needed. The free version shows ads and asks your permission before any tracking; Pro has no ads. Walls use a temporary room that holds only screen sizes and the name you choose, and it is deleted when the wall ends. Privacy: https://joinwall.siamclaw.com/privacy-policy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/