A virtual whiteboard for hand-drawn-style diagrams, wireframes, and sketches that works instantly in the browser with no sign-up.
Excalidraw is an infinite canvas with a deliberately rough, sketchy look that keeps diagrams feeling like drafts. It has shapes, arrows, freehand drawing, libraries of reusable components, real-time collaboration, and end-to-end-encrypted shared rooms. Drawings export to PNG/SVG or a portable `.excalidraw` file, and it runs fully offline as a PWA.
Why it's a discovery: zero friction — open the URL and draw — plus it's open source, so it's embedded in tools like Notion and VS Code. The optional Excalidraw+ subscription adds saved boards, team spaces, and presentations.
Best for: architecture sketches, quick wireframes, teaching diagrams, and anyone who wants a whiteboard without an account.
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