Excalidraw is a simple online tool for sketching and prototyping. You can hand-draw diagrams, flowcharts, UML diagrams, and more right in your browser. The drawings have a hand-drawn look and feel.

Best of all, Excalidraw allows for real-time collaboration. Multiple users can work on the same drawing at once from different devices. Your work is saved securely in your browser—no accounts are needed.

An excellent choice for remote work, online education, or personal projects, Excalidraw is a handy online sketching companion. Its hand-drawn style and collaborative design make for natural brainstorming, planning, and visual communication.