My rating
9/10
Pricing
Free
Category
Design Tools
Last reviewed
9 Jun 2026
What it is
Excalidraw is a free whiteboard for quick, sketchy diagrams — system architecture, database relationships, user flows. It's open source, needs no account, and its rough style keeps diagrams feeling like drafts so people actually give feedback.
Diagrams Whiteboard Architecture Free
Why I use it
My go-to for explaining system design to clients in a call. Quick, clear, and nobody mistakes a sketch for a final spec.
Alternatives I'd consider
Setting this up for your project?
I can integrate it properly or recommend a better fit for your case. Let's talk.
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