Excalidraw — Hand-Drawn Diagram Tool
Virtual whiteboard for architecture sketches and flows.
An open-source whiteboard whose sketchy style keeps early diagrams feeling provisional, which is exactly what you want while a system is still being argued about. Runs in the browser, exports to PNG or SVG, and the whole editor can be self-hosted or embedded.
diagramwhiteboardarchitecturesketch
What you get
- Web app + npm package — delivered from the official source, always the latest version.
- Licence: MIT / open source. Safe to use in personal and client work.
- No signup, no email wall, no download manager.