tldraw

tldraw is a free, instant collaborative whiteboard that runs in the browser on any device with no signup, known for its hand-drawn style and precise canvas interactions. The same canvas is offered to developers as the tldraw SDK, an infinite-canvas engine for React that other products build whiteboards, diagram tools and AI canvas experiments on. Designers open it for quick sketching, and design engineers to study how a canvas handles selection, arrows, snapping and multiplayer.