excalidraw

Excalidraw is a virtual whiteboard application for drawing diagrams and wireframes in a hand-drawn style. It works instantly in the browser with intuitive controls for quick idea visualization.

• Hand-drawn style rendering that gives shapes and text a warm, sketch-like appearance
• Real-time collaboration by sharing a URL with team members for simultaneous editing
• Library feature for saving and sharing frequently used shapes and components
• End-to-end encryption with keys embedded in URL fragments, never sent to servers
• Export to PNG, SVG, and clipboard for versatile sharing
• Embeddable as an npm package for integration into React applications

Built with React and TypeScript, Excalidraw requires no installation. It is widely used for design meetings, brainstorming sessions, and technical documentation illustration.