tldraw

A free and instant collaborative whiteboard application that runs entirely in the browser with no account required to start drawing. The platform provides an infinite canvas where teams can sketch diagrams, wireframe interfaces, map out user flows, and brainstorm ideas together in real time. The drawing tools include shapes, freehand pen, text, sticky notes, arrows, and frames that can be exported as images or shared via link. An embedded editor supports code blocks with syntax highlighting, making it useful for technical discussions and architecture planning. Multiplayer cursors show where each collaborator is working on the canvas, and the entire state synchronises instantly across participants. The open-source nature of the project means the community can extend functionality, and the developer API enables custom integrations. The platform is suitable for product designers, engineers, product managers, educators, and any team that needs a fast, frictionless way to visualise ideas and collaborate visually.