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A similar app without the sloppiness but also very easy to use is draw.io. I am so far very happy with it and it looks good.

It lacks the whiteboarding feature right?

https://sketch.diagrams.net uses the same rough.js lib as excalidraw

I don’t understand why you are replying to this thread and not the whole article? Is the thing you linked related to draw.io somehow?

It is related: draw.io was renamed to diagrams.net. You can see the redirect if you visit https://draw.io/.