Link-based rooms
CallPub creates a room ID and a ready-to-share invitation link; participants can also join by entering the room ID.
About the product
Discuss without switching tools
CallPub combines a call room with a visual workspace. Create a link, invite participants, share a screen, and immediately draw, write, or place images on the shared board.
The application runs in the browser without installation or registration. A new link creates a separate room, while clearing the board starts a fresh visual session inside the current room.
Core features
From invitation to a shared solution
Audio and video
Microphone, camera, mute controls, and device selection are available directly from the call panel.
Screen sharing
A shared screen appears beside the video streams and can be expanded or opened in fullscreen mode.
Synchronized whiteboard
Pen, eraser, lines, arrows, rectangles, and circles are transmitted to participants in real time.
Text and images
Objects can be added from a file, clipboard, or drag and drop, then moved, resized, and arranged in layers.
Live presence
The participant list, remote cursors, and animated pointer rings show who is present and what they are highlighting.
Workspace
Tools for talking and explaining
Communication
- participant names and status;
- microphone, camera, and speaker selection;
- microphone and camera controls;
- expanded video and screen views.
Whiteboard
- line colour and stroke width;
- single and double-ended arrows;
- canvas zooming and panning;
- undo and full clear.
Materials
- editable text blocks;
- image paste and upload;
- object layer ordering;
- whiteboard export to PNG.
Architecture
A lightweight browser tool
Peer-to-peer connections
WebRTC and PeerJS connect participants to exchange media and real-time collaboration events between browsers.
Local room state
The whiteboard state is stored in the browser separately for each room and restored when it is opened again.
No installation
A modern browser is enough to begin; microphone, camera, or screen access is requested only when those features are used.
Multiple screen sizes
Dedicated layouts support desktop, tablet, and mobile use.
Create a CallPub room
Open the application, copy the invitation link, and start a conversation with a shared whiteboard.