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Excalidraw
The hand-drawn whiteboard the whole internet sketches on.
Excalidraw is an open source virtual whiteboard with a charming hand-drawn style, ideal for architecture sketches and quick diagrams. Drawings are stored locally in your browser, and live collaboration links are end-to-end encrypted.
Best for: Use this when you need to sketch a system diagram that looks thoughtful rather than corporate.
Pros
- Local-first, your drawings stay in the browser
- End-to-end encrypted collaboration links
- Fast, minimal and open source
Cons
- The sketchy aesthetic is not right for formal documents
- Cloud workspaces and libraries live in the separate paid product
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