I’m curious what the relationship between Tldraw and Excalidraw is. They share some dependencies, and I think I remember @steveruizok adding this freehand ink feature to excalidraw. Is there a plan to rebase the excalidraw canvas on tldraw core? If I start prototyping a new UI today, should I start based on tldraw or excalidraw?

Yep, I'm a big fan of Excalidraw and am a contributor there too. I also re-implemented the pen tool in Excalidraw to use my digital ink library, perfect freehand (https://github.com/steveruizok/perfect-freehand), which is used extensively in tldraw.

tldraw is a separate project. The big difference is that Excalidraw renders to HTML canvas while tldraw renders to a regular DOM tree. There's a trade off: canvas can have better performance on some machines, while my approach with tldraw makes it easier to implement more complex embedded content. I wouldn't expect any changes, so use whichever you prefer!