Chalk
A shared whiteboard for the room. Everyone on the same Wi-Fi draws on the same board, live. No accounts, no internet, no telemetry — the strokes never leave your network.
Open the board →What you get
One board, liveEvery device in the room draws on the same canvas.
Works offlineRuns on a Wi-Fi network with the internet unplugged.
Colour & brushSeven colours, a size slider and an eraser.
Undo & clearTake back your last stroke, or wipe the board for everyone.
Save a PNGKeep a picture of the board before you clear it.
EN / हिन्दी / ગુજરાતીLanguage and light/dark, remembered.
How it works
One machine starts a room host (node host/room.js) and
prints its LAN address. Each device opens this board, pastes the address and taps
Join room. Strokes travel over the local network — Server-Sent Events one
way, plain POST the other — with no framework, no server to sign into and nothing
to install. A late joiner is caught up from the host's history automatically.