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Hi! I made ArcBrush. Never heard of Plasma Studio, and other than being node-based, I don't even see the similarity if I'm being honest.

Likely just a coincidence. There is a huge number of node-based image editors: https://www.google.com/search?q=node-based+image+editor&udm=...

Is there more of a smoking gun than its a node based editor?

Most of the game industry tooling is supporting that these days. Unreal, and Unity but also Houdini, Blender, Maya...

Node-based editors are not new.

The Arc homepage is clearly vibe slop but with 75 nodes and backend supposedly coded in C, it looks to me like it would have taken a couple of months to get here at least, certainly not a release within 1 week of Youtube-person's mention.

It doesn't seem to be open source unfortunately.